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TLB-6700 User Manual Rev D

1. The start of scan wavelength can be changed by selecting the Start X field and turning the control knob or using the navigation keys Setting the end of scan wavelength is just as easy as setting the starting wavelength This time select Stop 4 in the menu and then use the control knob to set the wavelength The laser will scan in whichever direction you set it The stop wavelength can be larger or smaller than the start wavelength but it is recommended to scan from short to long wavelengths Setting the Scan Velocity To set the forward scan velocity select the Fwd Vel field using the UP DOWN navigation keys and turn the control knob The reverse Stop A to Start scan velocity can be set by selecting the Rev Vel field and turning the control knob or with the navigation keys It is possible to adjust the forward and reverse scan velocities in 0 01 nm s increments Performing a Scan To start a scan push the Scan button If the laser is at the start wavelength it will begin scanning at the forward scan velocity Otherwise it will go to the Start wavelength at the reverse scan speed and begin the scan process When the laser arrives at the Stop wavelength it will stop briefly and return to Start wavelength at reverse scan velocity System Operation 35 4 7 4 4 8 4 9 4 10 4 10 1 4 10 2 There is a Trigger input on the rear panel of the controller Applying a voltage which rises above 3 V and
2. The voltage increases with wavelength according to the equation V 10 A_actual 1 min A_max min where max and 1 min are the maximum and minimum wavelength ratings nm of the laser head actual is the actual wavelength nm and V is the Wavelength Output voltage V 46 System Operation 4 11 8 4 11 9 Wavelength Input The Wavelength Input connector is for coarse analog control of the wavelength For example you could use it for your own analog wavelength scanning control The DC voltage that you apply to the Wavelength Input is digitized and a wavelength setpoint for wavelength control is determined A_setpoint 0 1 A_max A_min V A_min where A_max and A_ min are the maximum and minimum wavelength ratings nm of the laser head and V is the Wavelength Input voltage V If this feature is used for scanning please adjust the wavelength input modulation frequency such that the rate of change of A_setpoint does not exceed head s maximum scan speed If your analog control signal is not too noisy you should be able to control the wavelength in Angstrom or even sub Angstrom increments Note however that if you do not have a quiet analog control voltage this mode of operation has less wavelength stability than Track mode If you want to use the Wavelength Input connector you must first place the laser in Wavelength Input mode via local menu interface Set System Params menu Wav I
3. This manual has been provided for information only and product specifications are subject to change without notice Any change will be reflected in future printings New Focus 3635 Peterson Way Santa Clara CA 95054 USA Part No 90038357 Rev D Preface iii Confidentiality amp Proprietary Rights Reservation of Title The New Focus programs and all materials furnished or produced in connection with them Related Materials contain trade secrets of New Focus and are for use only in the manner expressly permitted New Focus claims and reserves all rights and benefits afforded under law in the Programs provided by New Focus New Focus shall retain full ownership of Intellectual Property Rights in and to all development process align or assembly technologies developed and other derivative work that may be developed by New Focus Customer shall not challenge or cause any third party to challenge the rights of New Focus Preservation of Secrecy and Confidentiality and Restrictions to Access Customer shall protect the New Focus Programs and Related Materials as trade secrets of New Focus and shall devote its best efforts to ensure that all its personnel protect the New Focus Programs as trade secrets of New Focus Customer shall not at any time disclose New Focus s trade secrets to any other person firm organization or employee that does not need consistent with Customer s right of use hereunder to obtain access to the New Fo
4. 14 Laser Head Mechanical Schematic forTLB 6700 series laser 31 Fig re 15 Front Panel Layout isinsin eiaa eaeasene 32 Figure 16 A Sample Setup Screen esse eee ee eee eee eee eee i eee Gis 36 Figure 17 A Sample Title Screen sese 37 Figure 18 A Sample Laser Head Information Screen sese eee eee 37 Figure 19 A Sample LDD and TEC Params Measurement Screen 38 Figure 20 Model 6700 Menu SQructure i210 daca seen eee 39 Figure 21 A Sample System Parameters Sub menu ee eee ee ee eee ee ee 40 Figure 22 A Sample Save Parameters Sub menu sese ee eee eee ee eee 41 Figure 23 A Sample Save Parameters Sub menu sese ee eee eee ee eee eee 41 Figure 24 A Sample Main Setup Screen when Errors Present 0 42 Figure 25 A Sample Setup Screen when Errors Present 42 Figure 26 Rear Dane szg crogaz intese anois aden eens 43 Figure 27 New Pocug Laser Cavity soiis ea ance heeded 80 Figure 28 Drawing of Important Angles and Optimal Pivot Point 81 List of Tables Table 1 Voltage Selector Switch Settings and Fuse Ratings 25 Preface This page is intentionally left blank 1 1 1 Safety Precautions Definitions and Symbols The following terms and symbols are used in this documentation and appear on the Model 6700 Tunable Diode Laser where safety related issues occur General Warning or Caution A Figure 1 General Warning or Caution Symbol The Exclamation Symbol in the figure above appears on
5. All information displayed in various 6700 screens with the exception of title screen laser head information screen and error message screen can be in one of two states selected or unselected A selected item can be in one of two states idle or active Up arrow indicator n Data Sl associated with item Down arrow indicator Figure 16 A Sample Setup Screen A selected item in idle state is indicated by a diamond symbol placed to the left of the item The idle state is the default state for a selected item In this state the present value of the item may be displayed next to the label depending upon the type of item Pressing the SETUP ENTER key will cause the instrument to display a sub menu for that item should one be available Otherwise it will change the display state for that item from idle to active A selected item in active state is indicated by flashing data associated with that item The cursor arrow keys can be used to modify the data numerical or non numerical Once the data has been modified pressing SETUP ENTER key will cause the instrument to accept the new data and return the item to idle System Operation 37 state Pressing the Esc key will cause the display to ignore any changes made and return to the previous menu An unselected item simply displays the item name Depending upon the item it may also display data associated with that item The Setup screens also have up and down
6. Drawing of Important Angles and Optimal Pivot Point 82 Principles of Operation 6 1 1 References 1 M G Littman and H J Metcalf Spectrally narrow pulsed dye laser without beam expander Applied Optics vol 17 p 2224 2227 1978 2 M G Littman Single mode operation of grazing incidence pulsed dye laser Optics Letters vol 3 p 138 140 1978 3 K Liu and M G Littman Novel geometry for single mode scanning of tunable lasers Optics Letters vol 6 p 117 118 1981 4 M G Littman Single mode pulsed tunable dye laser Applied Optics vol 23 p 4465 4468 1984 5 K C Harvey and C J Myatt External cavity diode laser using a grazing incidence diffraction grating Optics Letters vol 16 p 910 912 1991 6 T Day F Luecke and M Brownell Continuously tunable diode lasers Lasers and Optronics p 15 17 June 1993 5 7 Tips and Techniques 7 1 Introduction This section explains operational details of the Model 6700 Tunable Diode Laser and provides application examples 7 2 Grounding a Laser Head The 6700 Tunable Laser outputs are isolated from earth chassis ground Isolating the laser head case avoids damaging the device from multiple ground loop potentials AC transients or static discharge Since test equipment probes signal sources and package mounts are often partially earth grounded it is often necessary to also bond the device case t
7. System Operation The analog layer consists of four modules current control temperature control piezoelectric transducer PZT driver which controls wavelength fine tuning and the motion control for coarse wavelength tuning The digital layer includes a Digital Signal Processor DSP and user interface circuitry There is a digital circuit board in the laser head that contains information specific to each laser head such as the wavelength calibration table and the laser head serial number The current driver is a low noise analog DC current supply which provides up to hundreds of mA of current to the laser diode The AC ripple in the output is sub uA RMS If desired the current supply can be modulated at up to 1 MHz through a BNC connector on the rear panel of the controller For proper operation use only with a cable shorter than three meters The temperature driver controls the laser temperature by supplying current to thermoelectric Peltier elements in the laser head Precise temperature control is achieved through the use of a two stage system One thermoelectric element maintains the overall temperature of the laser cavity while another is specifically dedicated to the diode temperature within the cavity A DSP is used to perform PID feedback control for each element In this way the laser temperature and the surrounding environment are stabilized to within plus or minus 10 millikelvin The PZT driver supplies 0 120 Volts DC
8. ds 37 4 10 8 Laser Head Information Screen sese 37 4 10 9 Main Tle a a na a 38 4 10 10 Parameter Setup Screens sees eee ee eee 38 Preface vii AUT Rear TT ui e ES 43 4 11 1 USB Interface inonsan a 43 411 2 Chassis eE sre te st 43 4 11 3 AC POWET T 43 A VDA E AE E E E eee ianedes 44 4 11 5 Frequency Modulation Input sss sese sese eee eee 44 4 11 6 Current Modulation Inputs esse sese seer 45 4 11 7 WavelengthyOutpul 232 2 oncaeid ane 45 4 11 8 Wavelength Input s 2ce cgeetesostsuniet cannes tint eee sect 46 4 11 9 Auxiliary Input sss sese ereer eee 46 4 12 Constant Power Mode sss 47 5 Computer Interfacing 49 Dek Introductions e a E E TS 49 5 2 Computer Interface Terminology sese eee eee eee 49 5 2 1 lt gt Delimiting Punctuation sese eee eee eee eee 49 52 2 lt CR gt Cartridge Reminisce cia eee 49 3 2 3 lt LF gt Line Need esiciert ancora cae a sions 49 5 2 4 E SO MINCO OSs aenn dea iucasons a N EERS 50 5 2 5 Command TLerminaon en sss sese eee ee eee eee ee 50 5 2 6 Response Termination sese seer ee eee eree eee 50 5 3 Controller Operation Mode sss esse ss sese 50 5 44 USB Communication sese esse eee ee eee eee eee 50 Deo Commands SUMMIALY seri sain cans E A deo 51 JO I e aT 21 L TTT 51 55 2 Types f Command Siasig ak eet e a Go E icons 51 5 5 3 Index of Commands sss sese sese eee eee 53 5 6 Commands and Queries os iio Gn eee 55 6 Principles of Operation 79 Gil Theory Of Designers ei
9. panel of the controller An SMA connector is available on the outside of the head enclosure for high speed current modulation The use of this feature is described in Section 4 11 Rear Panel Finally the laser head records how many hours the diode laser has operated A new laser head will typically show 100 150 hours due to factory burn in System Operation WARNING Before operating the Model 6700 Tunable Diode Laser please read and understand all of Section 1 4 2 Using the Front Panel The front panel of the Model 6700 Tunable Diode Laser is designed for easy operation It has various distinct areas each with a specific set of related functions and a control knob as shown in Figure 15 below Tunable Laser Controller 118 6700 Figure 15 Front Panel Layout Make sure the controller is plugged into a wall socket and your laser head cable is plugged into the back of the controller Point the laser head in a safe direction and check that the AC power input connector is configured for the correct line voltage Turn on the AC power with the power switch on the left hand side of the back panel The calibration table laser head serial numbers and other pertinent operating information stored in an EEPROM in the laser head are uploaded to the controller The alphanumeric display will show the model number and the controller software revision number After a few seconds the display will become active About 30 minute
10. post on the rear of the chassis to earth ground While the protective ground wire within the MAINS power cord when connected to a properly earth grounded receptacle using the supplied power cord will provide adequate safety protection the system noise performance may be improved if this additional connection is made WARNING To avoid electric shock connect the instrument to properly earth grounded receptacles only Failure to observe these precautions can result in fire severe injury or death WARNING To avoid electric shock the appropriate fuses for the AC input AN power voltage must be installed in the instrument Only qualified service personnel should replace fuses Failure to observe these precautions can result in fire severe injury or death 3 7 3 Turning the Laser ON Press Mode button to select desired laser diode mode of operation constant current or constant power Use the UP DOWN navigation keys to select Current Power field in the main Menu display Turn the knob control to set the desired Current Power setpoint Turn lockout keyswitch to ON position Press Laser Power button The LED in the button will flash for 3 seconds and then stay ON The actual laser diode current power will quickly ramp up to the specified setpoint 28 Getting Started 3 7 4 3 7 5 For other functions such as adjusting wavelength fine frequency control setting scanning parameters enabling Wavelength
11. taken If the value is in range e The scan start wavelength is changed to specified value e The controller returns OK Argument Value Description Value MAX If the string MAX is specified as value the scan starting wavelength is set to diode s max rating MIN If the string MIN is specified as value the scan starting wavelength is set to diode s min rating Float Desired scan starting wavelength in nanometers nm SOURce WAVE START 70 Computer Interfacing SOURce WAVE STOP Description Syntax Remarks See Also Laser diode scanning stop wavelength SOURce WAVE STOP Value This command sets the laser diode scanning stop wavelength If the value specified is less than the laser diode s minimum wavelength rating or it is greater than the maximum wavelength rating e The controller returns V ALUE OUT OF RANGE e No other action is taken If the value is in range e The scan stop wavelength is changed to specified value e The controller returns OK Argument Value Description Value MAX If the string MAX is specified as value the scan stopping wavelength is set to diode s max rating MIN If the string MIN is specified as value the scan stopping wavelength is set to diode s min rating Float Desired scan stopping wavelength in nanometers nm SOURce WAVE STOP SOURce WAVE SLEW FORWard Description Syntax Remarks Wavelength scan
12. this reason New Focus does not recommend operation of the Model 6700 in close proximity to mobile telephones hand held radio transmitters and similar devices 2 Getting Started 3 1 Unpacking and Handling It is recommended that the Model 6700 Tunable Diode Laser be unpacked in a lab environment or work site Unpack the system carefully small parts are included with the instrument Inspect the box carefully for loose parts You are advised to save the packaging material in case you need to ship your equipment in the future 3 2 Inspection for Damage The Model 6700 Tunable Diode Laser is carefully packaged at the factory to minimize the possibility of damage during shipping Inspect the box for external signs of damage or mishandling Inspect the contents for damage If there is visible damage to the instrument upon receipt inform the shipping company and New Focus immediately Carefully open the box and save the shipping material for later use WARNING Do not attempt to operate this equipment if there is evidence of shipping damage or you suspect the unit is damaged Damaged equipment may present additional hazards to you Contact New Focus technical support for advice before attempting to plug in and operate damaged equipment CAUTION The user is advised to save the packaging material in case the unit has to be shipped to a different location The packaging material is specially designed to protect the unit during shippin
13. unit has temperature sensors If the unit overheats it will generate an error message and stop operation to protect itself until the user takes the necessary steps to lower the temperature Getting Started 25 3 6 Power Supplies WARNING To avoid electric shock the Model 6700 must be configured for operation on your specific AC line voltage PRIOR TO CONNECTING THE POWER CORD TO THE AC MAINS See the instructions above for information AC power is supplied through the rear panel power entry module connector that provides in line transient protection and RF filtering The power entry module also contains the instrument s fuses and the voltage selection switch Prior to plugging in the AC line cord the user MUST configure the Model 6700 for operation on the available AC power This is accomplished by setting the voltage selector switch on the AC power entry module AND verifying that the correct fuses are installed into the power entry module Failure to do this can result in degraded instrument performance damage to the Model 6700 and or injury to the operator The voltage selector switch and the fuses are accessed by opening the power entry module using a flat bladed screwdriver Note that the AC line cord must be removed from the power entry module prior to attempting to open it With the power entry module open the voltage selector switch setting can be changed by removing the drum rotating it to the desired setting and
14. w indicators to show that more items can be accessed by pressing UP and DOWN arrow keys respectively 4 10 7 Title Screen The Title screen is displayed for a few seconds every time the instrument is powered ON This screen is used to display the present firmware version of the instrument A sample Title screen is shown in Figure 17 New Focus TLB6700 LN Tunable Firmware semicon number Laser Controller Ver 1 0 0 0 Figure 17 A Sample Title Screen 4 10 8 Laser Head Information Screen The Laser Head Information screen is displayed for a few seconds after the Title screen every time the instrument is powered ON This screen is used to display the model number serial number revision number and calibration date of the laser head connected to the controller A sample screen is shown in Figure 18 TLB 6321 P1001 2 04 11 26 2010 Figure 18 A Sample Laser Head Information Screen 38 System Operation 4 10 9 4 10 10 Main Setup Screen The Main Setup screen is displayed after the controller has been powered ON for a few seconds This is the topmost level display during normal operation and it is used to change the laser current power wavelength and piezo voltage setpoints besides turning the wavelength track mode ON OFF A sample Main Setup screen is shown in Figure 19 eCurrent 150 00mA Lambda 780 00nm Piezo 75 00 3 Lambda Track Off Figure 19 A Sample LDD and TEC Params Measurement S
15. wavelength and power readouts e USB remote interface e No beam walking Instrument Features Intuitive Controls and LCD Display Improved data presentation and system control are achieved using a combination of LCD and 7 segment LED displays The LCD display shows the entire system configuration and status The 7 segment LED displays visibly show diode laser wavelength and output power Menu Keys guide you through initial system setup routines and operation Real time control of an output is accomplished either by entering the set point via the cursor keys or control knob SETUP ENTER and ARROW keys access saved system configurations and repetitive procedures All controls are clearly marked and instructions easily understood for simple operation Input Power The Model 6700 can be configured to operate on 100 120 220 or 240 volt AC power See Section 3 6 for information on how to configure the Model 6700 for operation on your country specific AC voltage General Information 21 2 3 2 3 1 Specifications Tunable Diode Laser Model Number 6701 6702 6703 6704 6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716 6717 6718 6719 6720 6721 6722 6723 6724 6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 Tuning Range nm Min 350 390 440 630 640 650 680 650 715 700 700 760 750 750 750 800 800 850 900 900 900 1000 1100 1200 1300 1400 1350
16. 00 is powered up WARNING Do not disconnect the cable between the Model 6700 and the laser head from the laser head while the Model 6700 is powered up WARNING Secure the connector screwlocks at both ends of the cable between the Model 6700 and the laser head 18 Safety Precautions The Model TLB 6700 Controller is intended for use in an industrial environment Use of this product in other environments such as residential may result in electromagnetic compatibility difficulties due to conducted as well as radiated disturbances 1 3 Location of Labels and Warnings 1 3 1 Rear Panel Fuse Label FREQUENCY CURRENT MODULATION MODULATION Seur pT WAVELENGTH WAVELENGTH AUXIUARY C7 PPUT OUTPUT RST LASER CONTROL T NO ROW E re 1000 vre cA o INTERLOCK ele O TRIGGER PEUT Model LT Serial Number and WEEE CE Label Symbol RoHS Label Figure 12 Rear Panel Labels and Warnings 2 General Information 2 1 Introduction The New Focus 6700 series External Cavity Tunable Diode Laser is a stable narrow linewidth source of tunable light The 6700 series laser can be operated manually from the front panel of the controller or remotely using computer control The 6700 series laser incorporates a simple stable mechanical design with a minimal number of optical components Low noise analog circuits precisely set critical operating parameters such as diode temperature
17. 1 5 Fuses The correct fuses must be installed into the fuse holder that is part of the AC power entry module Please check the fuse label on the rear panel before installing new fuses see Figure 26 WARNING To avoid electric shock the appropriate fuses for the AC input power voltage must be installed in the instrument Only qualified service personnel should replace fuses Failure to observe these precautions can result in fire severe injury or death Frequency Modulation Input The Frequency Modulation input is for external analog control of the wavelength through the voltage applied to the PZT on the tuning arm It is useful for making fine frequency adjustments and for FM spectroscopy Sweeping the Frequency Modulation input from 3 V to 3 V corresponds to changing the laser frequency by an amount on the order of 30 GHz to 30 GHz for certain models The actual modulation you will observe depends on the wavelength range of the laser head see the Acceptance Test Data Sheet of your particular laser and on the rate and amplitude of the incoming signal for example full 30 GHz modulation is only available at rates up to 200 Hz The Frequency Modulation input will accept triangle waveforms from DC to 2 kHz with an amplitude of 0 3 V and DC to 700 Hz with an amplitude of 3V The instrument will protect itself from going over these signal values to prevent overheating of the piezo actuator or internal circuitry
18. 1400 1400 1400 1550 1600 1700 1900 1900 Max 400 440 500 640 650 680 700 750 750 800 800 800 850 850 900 950 950 1000 1100 1100 1100 1200 1300 1400 1500 1600 1600 1700 1700 1700 1750 1900 2200 2300 2500 Maximum Power mW 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 450 22 General Information 2 3 2 General Specifications Environmental Specifications Voltage Requirements 100 120 220 240 VAC 50 60Hz Power Requirements MAX POWER 170 Watts Chassis Ground 4 mm banana jack Size H x W x D in mm 3 48 88 4 x 14 0 355 6 x 16 51 419 4 Mainframe Weight Ib kg 17 9 8 1 Operating Temperature 10 C to 40 C lt 90 humidity non condensing Storage Temperature 0 C to 50 C lt 90 humidity non condensing Relative Humidity Storage lt 90 humidity non condensing Altitude lt 3000 meters 10000 feet Installation Category Pollution Degree 2 Use Location Indoor use only The Model 6700 Tunable Diode Laser is designed to operate in a controlled electromagnetic environment While it will not be damaged by operation in an industrial electromagnetic environment as defined in EN61316 1 2006 such operation may not yield optimal performance For
19. DISCONNECTED Diode Driver subsystem output ON without having a laser head connected to the controller 920 LASER EEPROM This error is generated when user tries to connect a laser ERROR head to the controller using an incompatible cable 91 This page is intentionally left blank New Focus Worldwide Headquarters 3635 Peterson Way Santa Clara CA 95054 In U S 877 835 9620 Tel 408 980 4300 Fax 408 919 6083 Internet sales newfocus com Vv New Focus A Newport Corporation Brand Visit New Focus Online at Newport Corporation Irvine California Evry and Beaune La Rolande France have all been certified compliant with ISO 9001 by the British Standards Institution Mountain View California is DNV certified Printed in U S A
20. Diode power setpoint Diode temperature setpoint Cavity temperature setpoint 10 Wavelength input enable state 11 Wavelength setpoint 12 Piezo voltage setpoint 13 Starting wavelength for scan process 14 Stopping wavelength for scan process 15 Forward scan velocity 16 Return scan velocity 0200 SOW Oi Go ho See Also RST SAV 56 Computer Interfacing RST Description Reset command Syntax RST Remarks This command performs a soft reset of the instrument See Also RCL SAV Description Save command Syntax SAV Bin Argument Value Description Bin 2 to5 Saves current settings to specified bin Remarks This command stores the current state of the instrument in non volatile flash memory This state is then recalled using the RCL command See description of RCL command for a list of values saved recalled by the instrument See Also RCL OPC Description Operation Complete Query Syntax OPC Remarks The laser has three long term operations wavelength scanning wavelength scan resetting and setting the wavelength Starting any of these three operations clears the OPC status bit When the laser reaches the target wavelength the OPC status bit is set to 1 The bit is also set to 1 if the movement is interrupted by stopping resetting the scan process or by turning OFF the wavelength Track mode This query command returns the OPC status bit Response Description Status 0 Performing a long term op
21. Input mode etc refer to System Operation Turning the Laser OFF To minimize the risk of power surges damaging the laser diode push the Laser Power button to turn OFF the laser when it is not in use the LED on the button will turn off and before shutting down the system Turn the back panel AC switch off to shut down the entire system Software Installation For instructions on how to install the software provided with the controller please refer to TLB 6700 CD ReadMe pdf file available on the CD You need to have a PDF reader to view its content d System Operation 4 1 Description of Laser System 4 1 1 Controller The job of the controller is to provide a stable low noise power source for the diode laser set the temperature in the laser head control wavelength scanning and provide readouts of all relevant laser parameters Conceptually the circuitry inside the controller is built in two layers analog and digital The analog layer incorporates low noise design for temperature current and wavelength fine tuning The digital layer includes all the readouts and circuits to set operating points and scan parameters This layer acts as an interface between the user or the user s computer and the analog layer User Inputs Local Control Panel LEDs ME Interface Current Temp AvA Laser Radiation Out Microprocessor Motion Control Figure 13 Controller Block Diagram 30
22. Model TLB 6700 LN TLB 6700 XP Tunable Diode Laser User s Manual Vv New Focus A Newport Corporation Brand EU Declaration of Conformity We declare that the accompanying product identified with the C E mark complies with requirements of the Electromagnetic Compatibility Directive 2004 108 EC and the Low Voltage Directive 2006 95 EC Model Numbers TLB 6700 LN TLB 6700 XP Year C mark affixed 2010 Type of Equipment Electrical equipment for measurement control and laboratory use in industrial locations Manufacturer Newport Corporation 1791 Deere Avenue Irvine CA 92606 Standards Applied Compliance was demonstrated to the following standards to the extent applicable BS EN61326 1 2006 Electrical equipment for measurement control and laboratory use EMC requirements for use in a controlled electromagnetic environment This equipment meets the CISPR 11 2009 A1 Class A Group 1 radiated and conducted emission limits BS EN 61010 1 2010 Safety requirements for electrical equipment for measurement control and laboratory use Vink Covet Mark Carroll Sr Director Instruments Business Newport Corporation 1791 Deere Ave Irvine CA92606 USA Preface Warranty New Focus warrants that this product will be free from defects in material and workmanship and will comply with Newport s published specifications at the time of sale for a period of one year from date of shipme
23. POWer DIODe Set diode power setpoint SOURce VOLTage PIEZo Set piezoelectric voltage setpoint SOURce VOLTage PZGAIN Set piezoelectric voltage gain Computer Interfacing SOURce WAVElength Set diode wavelength setpoint SOURce WA VE DESSCANS Set desired number of scans SOURce WAVE SCANCFG Set scan configuration SOURce WAVE START Set starting wavelength for scan SOURce WAVE STOP Set stopping wavelength for scan SOURce WAVE SLEW FORWard Set wavelength scan forward velocity SOURce WAVE SLEW RETurn Set wavelength scan return velocity Source Query Commands Syntax Description SOURce CPOWer Query constant power mode SOURce CURRent DIODe Query diode current setpoint SOURce POWer DIODe Query diode power setpoint SOURce TEMPerature DIODe Query diode temperature setpoint SOURce TEMPerature CA Vity Query cavity temperature setpoint SOURce VOLTage PIEZo Query piezoelectric voltage setpoint SOURce WAVElength Query diode wavelength setpoint SOURce WA VE ACTSCANS Query actual number of scans SOURce WA VE DESSCANS Query desired number of scans SOURce WAVE SCANCFG Query scan configuration SOURce WAVE START Query starting wavelength for scan SOURce WAVE STOP Query stopping wavelength for scan SOURce WAVE MAXVEL Query wavelength scan ma
24. Rce CURRent DIODe Value This command sets the diode laser current If the value specified is greater than the diode current rating e The controller returns VALUE OUT OF RANGE e No other action is taken If the value is in range e The diode laser current is changed to specified value e The controller returns OK Argument Value Description Value MAX If the string MAX is specified as value the diode current setpoint is set to the diode s current rating Float Desired diode laser current in milliamperes mA SOURce CURRent DIODe 66 Computer Interfacing SOURce POWer DIODe Description Diode laser output power set Syntax SOURce POWer DIODe Value Remarks This command sets the diode laser output power If the value specified is greater than the diode power rating e The controller returns V ALUE OUT OF RANGE e No other action is taken If the value is in range e The diode laser power is changed to specified value e The controller returns OK Argument Value Description Value MAX If the string MAX is specified as value the diode power setpoint is set to the diode s power rating Float Desired diode laser power in milliwatts mW See Also SOURce POWer DIODe SOURCce VOLTage PIEZo Description Syntax Remarks See Also Piezoelectric transducer voltage set SOURce VOLTage PIEZo Value This command sets the piezoelectric transducer voltage If the value specified is great
25. The protection gradually decreases the input amplitude if the user inadvertently goes over the specified amplitude values In the rare occasions when the unit overheats especially when the vents are obstructed or the temperature in the room is above specifications the unit will temporarily reduce the input signal amplitude to 1 10 of the maximum value The instrument automatically resumes normal operation when the user responds appropriately to cool the system or reduce the input signal or frequency Decreasing voltage at the Frequency Modulation input corresponds to a decrease in piezo voltage and an increase in laser frequency or a decrease in laser wavelength This decrease in piezo voltage is effectively subtracted from the front panel knob setting and the front panel display reads the result System Operation 45 4 11 6 4 11 6 1 4 11 7 Current Modulation Input The Current Modulation input allows you to modulate the diode current at rates up to 1 MHz This input accepts 10 to 10 V into a DC coupled 5 k Q resistive load and provides 0 2 mA V modulation This input is summed with the front panel setting Note that the front panel current readout does not reflect the modulation input High Speed Current Modulation For high speed current modulation up to 100 MHz an SMA connector on the laser head is provided This input is AC coupled the low and high frequency roll off points are below 10 kHz and about 100 MHz depending
26. USB connector a LASER CONTROL connector a TRIGGER INPUT connector an AUXILIARY INPUT connector a FREQUENCY MODULATION INPUT connector a CURRENT MODULATION INPUT connector a WAVELENGTH INPUT connector a WAVELENGTH OUTPUT connector an INTERLOCK connector a POWER SWITCH the AC power entry module and a GROUND post Frequency Modulation Current Modulation Trigger Input Wavelength Input Wavelength Chassis Output Auxiliary Ground Input Figure 26 Rear Panel 4 11 1 USB Interface The instrument is designed to communicate with standard USB Host interfaces The connector on the rear panel is a standard USB B Full Size Device 4 11 2 Chassis GND This 4 mm banana jack is connected to chassis ground It is intended to be used as an additional earth ground connection for the Model 6700 s enclosure 4 11 3 AC Power The Model 6700 can be operated on either 50 or 60 Hz mains power The instrument can be configured for operation at the following nominal AC line voltages 100 120 220 230 or 240 VAC See section 3 6 for information on properly configuring the Model 6700 for the available mains power The line cord supplied with each unit should be plugged only into a properly grounded outlet to prevent electrical shock in the event of an internal short circuit to the metal cabinet The detachable line cord should be connected to the IEC320 connector on the power entry module 44 System Operation 4 11 4 4 1
27. and current Digital control facilitates remote operation and computer interfacing The 6700 is a modular system The same control unit will work with any 6700 series laser head The control units work in both manual and remotely programmed modes and are compatible with USB interfaces Digital Signal Processor DSP based motion control allows you hands free wavelength scanning capability You set the start and stop wavelengths and scanning speed and the microprocessor controlled DC motor takes care of the rest The unique cavity design enables continuous mode hop free tuning Two seven segment LED digital readouts and a multi line LCD display show important operating parameters including wavelength and laser power Inputs are available for low speed and high speed diode current modulation Key Product Features Versatile tuning performance e Sweep step and fine tuning modes e Fine tuning with the PZT at 0 1 GHz resolution e Coarse tuning with the DC motor for up to 80 nm mode hop free tuning e Smooth linear mode hop free sweeps 20 General Information 2 1 1 2 2 Low noise amp narrow linewidths e lt 200 kHz linewidths e gt 40 dB side mode suppression ratios Flexible configurations e Wavelengths from 630 nm to 2 um e Fiber coupled and free space outputs e Current modulation wavelength control and FM modulation e Constant power and constant current modes Plug amp play e Automated wavelength scans with
28. ation complete status BEEP Set controller beeper status BEEP Query controller beeper status BRIGHT Set Menu display brightness level BRIGHT Query Menu display brightness ERRSTR Query error string LOCKOUT Set controller front panel state LOCKOUT Query controller front panel state ONDELAY Set laser output ON delay ONDELAY Query laser output ON delay Output Commands Syntax Description OUTPut STATe Set laser output enable state OUTPut STATe Query laser output enable state OUTPut TRACk Set wavelength track mode OUTPut TRA Ck Query wavelength track mode OUTPut SCAN START Start wavelength scan process OUTPut SCAN STOP Stop wavelength scan process OUTPut SCAN RESET Reset wavelength scan process Sense Commands Syntax Description SENSe CURRent DIODe Sense diode current SENSe POWer DIODe Sense diode power SENSe TEMPerature DIODe Sense diode temperature SENSe TEMPerature CA Vity Sense cavity temperature SENSe VOLTage A UXiliary Sense voltage from auxiliary input SENSe VOLTage PIEZo Sense piezo actuator actual voltage SENSe VOLTage WA VEIN Sense voltage from wavelength input SENSe WAVElength Sense output wavelength Source Control Commands Syntax Description SOURce CPOWer Set constant power mode SOURce CURRent DIODe Set diode current setpoint SOURce
29. ation setting SOURce WAVE SCANCFG SOURce WAVE START Description Syntax Remarks See Also Laser diode scanning start wavelength query SOURce WAVE START This query returns the laser diode scan starting wavelength Response Description Value Laser diode scan starting wavelength in nanometers nm SOURce WAVE START SOURce WAVE STOP Description Syntax Remarks See Also Laser diode scanning stop wavelength query SOURce WAVE STOP This query returns the laser diode scan stopping wavelength Response Description Value Laser diode scan stopping wavelength in nanometers nm SOURce WAVE STOP SOURce WAVE MAXVEL Description Syntax Remarks See Also Laser diode scanning maximum velocity query SOURce WAVE MAXVEL This query returns the laser diode scanning maximum velocity Response Description Value Laser diode wavelength scanning maximum velocity in nanometers sec nm sec SOURce WA VE SLEW FOR Ward SOURce WAVE SLEW RETurn Computer Interfacing 75 SOURce WAVE SLEW FORWard Description Syntax Remarks See Also Laser diode wavelength scan forward velocity query SOURce WAVE SLEW FORWard This query returns the laser diode wavelength scan forward velocity Response Description Value Laser diode wavelength scan forward velocity in nanometers sec nm s SOURce WAVE SLEW FORWard SOURce WAVE SLEW REtTurn Description Syntax Remarks S
30. ature CA Vity This command returns the magnitude of actual laser cavity temperature The laser cavity temperature is actively maintained by the controller at about 30 C If the room temperature ever gets so high that the coolers have insufficient capacity to reduce the temperature the control loop can become unstable and destroy the cooling elements To prevent damage the laser is automatically shut down if the laser diode gain element temperature exceeds 35 C Response Description Value Actual laser diode gain element temperature in degC C SOURce TEMPerature CA Vity SOURce TEMPerature CA Vity SENSe VOLTage AUxXiliary Description Syntax Remarks See Also Actual auxiliary detector input voltage query SENSe VOLTage A UXiliary This command returns the magnitude of actual auxiliary detector input voltage The resolution of this voltage is about 79uV Response Description Value Actual auxiliary detector input voltage in Volts V SENSe VOLTage WA VEIN 64 Computer Interfacing SENSe VOLTage PIEZo Description Syntax Remarks See Also Actual piezo voltage query SENSe VOLTage PIEZo This command returns the magnitude of actual piezo voltage Response Description Value Actual piezo voltage in Volts SOURce VOLTage PZGAIN SOURce VOLTage PIEZo SENSe VOLTage WAVEIN Description Actual wavelength input voltage query Syntax SENSe VOLTage WA VEIN Remarks T
31. commanded to turn on by pushing the LASER POWER button on front panel of instrument when it is in local control mode Argument Value Description Time Integer Time in milliseconds Valid values are between 3000 and 60000 See Also ONDELAY LAS OUT LAS OUT ONDELAY Description Laser turn on delay query Syntax ONDELAY Remarks This command returns the laser turn on delay time Response Description Value Time in milliseconds See Also ONDELAY LAS OUT LAS OUT 60 Computer Interfacing OUTPut STATe Description Syntax Remarks See Also Laser output enable command OUTPut STATe State This command turns the laser ON or OFF When turning the laser ON the light above the front panel s LASER POWER switch will flash for five seconds default before the power is turned ON The flash time can be changed using the ONDELAY command Argument Value Description State String or Integer U or OFF turns the laser OFF 1 or ON turns the laser ON ONDELAY OUTPut STATe OUTPut STATe Description Laser output enable state query Syntax OUTPut STATe Remarks This command returns the laser output enable state Response Description Value 0 laser output OFF 1 laser output ON See Also ONDELAY OUTPut STATe OUTPut TRACK Description Wavelength Track mode command Syntax OUTPut TRACK Mode Remarks This command is used to turn the wavelength Track mode ON or OFF When the Track mode is turned ON the laser wavelen
32. creen Parameter Setup Screens The setup screens are used to view and modify scan and system settings These screens can be accessed from the Main Setup screen by pressing the Setup Enter key System Operation 39 Start Stop Fwd Vel Rev Vel Num Scans Low Rev Pwr Brightness Lock Dial Aud Beep USB Address Wav Input PZT Gain Home Lambda Save Settings Recall Settings Get System Status Las Temp Cav Temp Las Pwr Aux Volt Wav Volt PZT Volt On Time Tot Time Model S N CD lt Date Figure 20 Model 6700 Menu Structure 40 System Operation 4 10 10 1 4 10 10 2 Set System Params Menu The Set System Params menu item is used to change display brightness lock the dial on the front panel turn beeper ON OFF USB address and to save recall system settings To modify these constants use the UP and DOWN arrow keys to select this menu item Press the SETUP ENTER key to enter a sub menu for this item A sample sub menu for setting the system parameters is shown in the figure below Brightness Lock Dial Aud Beep USB Address Figure 21 A Sample System Parameters Sub menu Use the UP and DOWN arrow keys to select the parameter that needs to be modified Once the desired item has been selected press the SETUP ENTER key to change the item s state from idle to active Once the item is in active state use the cursor keys to specify a desired value Once the desired value has been selected p
33. cus Programs and Related Materials These restrictions shall not apply to information 1 generally known to the public or obtainable from public sources 2 readily apparent from the keyboard operations visual display or output reports of the Programs 3 previously in the possession of Customer or subsequently developed or acquired without reliance on the New Focus Programs or 4 approved by New Focus for release without restriction Trademarks The New Focus logo and name are registered trademarks of Newport Corporation in Mexico Israel Singapore European Union Taiwan Hong Kong China Japan Korea Canada Australia and the United States Service Information This section contains information regarding factory service for the source The user should not attempt any maintenance or service of the system or optional equipment beyond the procedures outlined in this manual Any problem that cannot be resolved should be referred to New Focus Preface Technical Support Contacts North America Europe New Focus Newport MICRO CONTROLE S A 3635 Peterson Way Santa Clara CA 95054 Zone Industrielle Telephone 866 683 6287 45340 Beaune la Rolande FRANCE Telephone 408 919 1500 Telephone 33 02 38 40 51 56 Asia Newport Opto Electronics Technologies HE EAT RA 2535 BAB SRE 32 CSI WBa 200131 253 Aidu Road Bld 3 Fir 3 Sec C Shanghai 200131 China Telephone 86 21 5046 2300 Fax 86 21 5046 2323 Newport Co
34. e e The desired number of scans is changed to specified value e The controller returns OK Argument Value Description Value Integer Desired number of scans SOURce WA VE DESSCANS SOURce WA VE START SOURce WAVE SCANCFG Description Syntax Scan configuration set SOURce WAVE SCANCEG Value Computer Interfacing 69 Remarks See Also This command sets the scan configuration This setting is used by the controller to determine whether laser output power must be reduced to 0 or otherwise when scanning in the reverse direction from Stop Wavelength to Start Wavelength If the value specified is greater than 255 e The controller returns VALUE OUT OF RANGE e No other action is taken If the value is in range e The scan configuration is changed to specified value e The controller returns OK Argument Value Description Value 0 Do not reduce the laser output power to 0 during reverse scan 1 Reduce the laser output power to 0 during reverse scan SOURce WA VE SCANCFG SOURce WAVE START SOURce WAVE START Description Syntax Remarks See Also Laser diode scanning start wavelength SOURce WAVE START Value This command sets the laser diode scanning start wavelength If the value specified is less than the laser diode s minimum wavelength rating or it is greater than the maximum wavelength rating e The controller returns VALUE OUT OF RANGE e No other action is
35. e protection provided by this equipment may be impaired To prevent damage to equipment when replacing fuses locate and correct the problem that caused the fuse to blow before re applying power Do not block ventilation openings Do not position this product in such a manner that would make it difficult to disconnect the power cord Position the equipment so that access to the mains disconnect On Off switch is readily available Use only the specified replacement parts Follow precautions for static sensitive devices when handling this equipment This product should only be powered as described in the manual There are no user serviceable parts inside the Model 6700 Tunable Diode Laser Adhere to good laser safety practices when using this equipment Safety Precautions 1 2 3 Summary of Warnings and Cautions The following general warning and cautions are applicable to this instrument WARNING Before operating the Model 6700 Tunable Diode Laser please read and understand all of Section 1 WARNING Do not attempt to operate this equipment if there is evidence of shipping damage or you suspect the unit is damaged Damaged equipment may present additional hazards to you Contact Newport technical support for advice before attempting to plug in and operate damaged equipment WARNING To avoid electric shock connect the instrument to properly earth grounded 3 prong receptacles only Failure to observe this precaut
36. e instrument 8 5 Warranty New Focus a division of Newport Corp guarantees its lasers to be free of defects for one year from the date of shipment or for 3000 hours of operation whichever comes first This is in lieu of all other guarantees expressed or implied and does not cover incidental or consequential loss 87 8 6 Service Form New Focus U S A Office 408 919 1500 FAX 408 980 6083 Name Return Authorization Please obtain RA prior to return of item Company Please obtain RA prior to return of item Address Date Country Phone Number P O Number FAX Number Item s Being Returned Model Serial Description Reason for return of goods please list any specific problems 88 Maintenance and Service This page is intentionally left blank 9 Appendix A Error Messages 9 1 Introduction The laser controller will indicate an error code in the wavelength display if it is unable to perform its proper functions Some of these errors can be cleared by switching the laser controller off and then back on If the errors persist please contact New Focus for assistance The communication errors can be retrieved with the following commands via USB ERRSTR The descriptions of the returned errors are detailed in the next sections 9 2 Error Description A description of error codes and corresponding error strings generated by the TEC Driver is given b
37. ected to recall the system settings from the bin number selected earlier The instrument will automatically return to the Measurement screen once the recalling process has completed Error Message Screen Whenever the instrument generates an error message a flashing E symbol is shown on the left top corner of the Measurement screen as shown in figure below Users can retrieve this error message from the instrument from the Error Message screen To retrieve error messages press the SETUP ENTER key to view the setup menu The first menu item will be GET ERRORS as shown in the figure below 150 00mA 780 00nm Error a Message 75 00 Wna Lambda Track Off Figure 24 A Sample Main Setup Screen when Errors Present GET ERRORS Set Scan Params Set System Params Get System Status w Figure 25 A Sample Setup Screen when Errors Present Select the Get Errors menu item by pressing the UP arrow key Once this item is selected press SETUP ENTER key to enter the Error Messages screen All the error messages generated are listed on this screen in a chronological order oldest first All the error messages can be viewed by pressing the UP and DOWN arrow keys Press the Esc key to return to the Setup screen Note that this process removes the errors from error buffer and they will not be available for querying via USB communication interface System Operation 43 4 11 Rear Panel Interlock The Model 6700 rear panel has a
38. ee Also Laser diode wavelength scan return velocity query SOURce WAVE SLEW RETurn This query returns the laser diode wavelength scan return velocity Response Description Value Laser diode wavelength scan return velocity in nanometers sec nm s SOURce WAVE SLEW RETurn SYSTem ENTIME Description Syntax Remarks See Also Laser enable time query SYSTem ENTIME This query returns the amount of time laser diode output has been enabled Response Description Value Laser diode enable time in minutes min OUTPut STATe SYSTem MCONtrol Description Syntax Remarks Controller REMOTE LOCAL operation mode set command SYSTem MCONtrol Mode This command is used to put the controller in remote local operation mode The controller will be in LOCAL mode by default following a power reset In this mode all the main setpoints scan parameters and other system parameters can be adjusted by turning the control knob on front panel of the controller Output can be turned ON and OFF by pressing the Laser Power button When it is in 76 Computer Interfacing REMOTE mode knob control is disabled setpoints and other settings can be adjusted only by issuing appropriate commands from a host PC Argument Value Description Mode String REM sets the controller to REMOTE mode LOC sets the controller to LOCAL mode See Also SYSTem MCONtrol SYSTem MCONtrol Description Syntax Remarks See Also Contr
39. elow Error Error String Description Code 0 NO ERROR No error exists in the error buffer 116 SYNTAX ERROR This error is generated when the instrument receives a command that cannot be processed Some typical causes a Using ASCII characters outside of a string constant that are not defined by the command language syntax b Missing space between a set command and parameter c Missing character in case of query 126 WRONG NUM OF This error is generated when the instrument is unable to PARAMS process a command due to a mismatch between the number of parameters received and the number of parameters required for the command 201 VALUE OUT OF This error is generated when the instrument is unable to RANGE process a command because the parameter value received is out of range of the acceptable values for the command 424 TEC OVER TEMP The temperature control subsystem output has been turned OFF because the internal heatsink temperature has 90 Appendix A Error Messages exceeded safe levels Please allow the unit to cool down and reset the controller by turning it OFF and back ON 501 LDD INTERLOCK The Laser Diode Driver subsystem output has been turned FLT OFF because of remote interlock BNC connector on rear panel assertion 502 LDD CURRENT The Laser Diode Driver subsystem output has been turned LIMIT OFF because of actual current exceeding the c
40. ength Description Laser diode wavelength set Syntax SOURce WAVElength Value Remarks This command sets the laser wavelength setpoint If the value specified is less than the laser diode s minimum wavelength rating or it is greater than the maximum wavelength rating e The controller returns VALUE OUT OF RANGE e No other action is taken 68 Computer Interfacing If the value is in range e The wavelength setpoint is changed to specified value e The controller returns OK e Ifthe wavelength Track mode is ON the controller will drive the tuning motor until the actual diode wavelength is equal to the value specified here Argument Value Description Value MAX If the string MAX is specified as value the diode wavelength setpoint is set to diode s max rating MIN If the string MIN is specified as value the diode wavelength setpoint is set to diode s min rating Float Desired wavelength in nanometers nm See Also SOURce WAVElength SOURce WAVE DESSCANS Description Syntax Remarks See Also Desired number of scans set SOURce WAVE DESSCANS Value This command sets the desired number of scans This setting is used by the controller to repeat a scan operation from Start Wavelength to Stop Wavelength once a scan is started If the value specified is less than 1 or it is greater than 9999 e The controller returns VALUE OUT OF RANGE e No other action is taken If the value is in rang
41. er s to follow SOURce WAVElength START 780 00 For example the value 780 00 in the command SOURce WAVElength START 780 00 sets the start scan wavelength to 780 00 nm The command query MUST contain all of the letters shown in upper case lower case letters in the commands are optional and may be used for clarity The commands may be sent to the instrument in either upper or lower case or in any combination For example the following commands are equal SOURce WAVElength START 780 00 SOUR WAVE START 780 00 source wave start 780 00 Source Wavelength Start 780 00 COMMAND TERMINATION All commands sent to the controller must be terminated by lt Carriage Return gt lt Line Feed gt characters All responses sent out by the controller are terminated by the same characters Types of Commands There are six general types of commands Standard Commands Output Commands Sense Commands Source Controls Source Queries and System Commands Standard Commands allow you to get information about the laser head and to query whether an operation has been completed Output Commands tell the laser to start some action such as starting or stopping a scan or reset System Commands set the operating mode of the controller Source Controls set laser operating parameters Each Source Control has an accompanying Query Source Queries return the value of various controller set points 52 Computer Interfacing Sense Commands return
42. er than 100 e The controller returns VALUE OUT OF RANGE e No other action is taken If the value is in range e The piezo voltage is changed to specified value e The controller returns OK Argument Value Description Value MAX If the string MAX is specified as value the piezo voltage setpoint is set to 100 Float Desired piezo voltage in percentage SOURce VOLTage PIEZo Computer Interfacing 67 SOURce VOLTage PZGAIN Description Syntax Remarks See Also Piezoelectric transducer voltage gain set SOURce VOLTage PZGAIN Value This command sets the piezoelectric transducer voltage gain If the value specified is greater than 1 e The controller returns VALUE OUT OF RANGE e No other action is taken If the value is in range e The piezo voltage gain is changed to specified value e The controller returns OK Argument Value Description Value HIGH or 1 If the string HIGH or 1 is specified as value the piezo voltage gain is set to 20x LOW If the string LOW or 0 is specified as value the piezo voltage gain is set to 1x SOURce VOLTage PZGAIN SOURce VOLTage PZGAIN Description Piezoelectric transducer voltage gain query Syntax SOURce VOLTage PZGAIN Remarks This query returns the piezo voltage gain setting Response Description Value Piezo voltage gain 1 20x gain 0 Ix gain See Also SOURce VOLTage PZGAIN SOURce WAVEl
43. eration Status 1 Not performing a long term operation system is available See Also OUTPut SCAN START OUTPut SCAN STOP OUTPut SCAN RESET OUTPut TRACk SOURce WAVElength Computer Interfacing 57 STB Description Status byte Query Syntax STB Remarks This command is used to query the status of the controller A response of 128 implies that the controller s error buffer is not empty This buffer can be emptied by issuing ERRSTR command and reading error messages from the controller Response Description Status 0 The error buffer is empty Status 128 The error buffer is not empty See Also ERRSTR BEEP Description Beep command Syntax BEEP beep set Remarks This command controls the instrument s beeper The beeper is used to signal error or warning conditions Response Value Description beep set 0 Beeper off 1 Beeper on 2 Test beeper 100ms beep See Also BEEP BEEP Description Beep query Syntax BEEP Remarks This query returns the enable status of the beeper See Also Response Description beep set U Beeper off 1 Beeper on BEEP 58 Computer Interfacing BRIGHT Description Display brightness command Syntax BRIGHT brightness Remarks This command controls the brightness of the controller display Argument Value Description brightness Integer Brightness in percentage from 1 to 100 See Also BRIGHT BRIGHT Description Display brightness query Syntax BRIGHT Remarks This query re
44. f waves in the cavity must be kept constant even though the wavelength of the light in the cavity is changing The number of waves in the cavity is maintained by having the tuning mirror rotate around a specific pivot point The pivot point creates a relationship between the cavity length and the laser wavelength The laser wavelength is set by the standard law for diffraction of light off a grating X A sin sin Principles of Operation 81 where A is the spacing between grooves in the grating while 0 and 0 refer to the incident and diffracted angles of the laser beam measured from a line normal to the surface of the grating The length D of the cavity can be broken into two parts l and l2 See Figure 28 If we call the distance from the pivot point to the place where the beam strikes the grating L we can see from the figure that l Lsin and l Lsin g Therefore the total cavity length is L sin sin g Dividing the total cavity length by the wavelength shows that the total number of waves in the cavity is L A which is a constant By designing a mechanical system where this condition is maintained over the tuning range of the laser the cavity can tune mode hop free over extended wavelength ranges In the next section we ll show how the theory is put into practice by describing the components of the New Focus 6700 series laser system HR 0 Normal to grating S Grating Pivot Point Figure 28
45. forward velocity set SOURce WAVE SLEW FORWard Value This command sets the wavelength scan forward velocity setpoint If the value specified is greater than the maximum velocity rating of the laser head e The controller returns VALUE OUT OF RANGE e No other action is taken If the value is in range e The wavelength scan forward velocity is changed to specified value e The controller returns OK Argument Value Description Value MAX If the string MAX is specified as value the wavelength scan forward velocity is set to diode s max rating Computer Interfacing 71 See Also Float Desired wavelength scan forward velocity in nanometers sec nm s SOURce WAVE SLEW FOR Ward SOURce WAVE SLEW REtTurn Description Wavelength scan return velocity set Syntax SOURce WAVE SLEW RETurn Value Remarks This command sets the wavelength scan return velocity setpoint If the value specified is greater than the maximum velocity rating of the laser head e The controller returns V ALUE OUT OF RANGE e No other action is taken If the value is in range e The wavelength scan return velocity is changed to specified value e The controller returns OK Argument Value Description Value MAX If the string MAX is specified as value the wavelength scan return velocity is set to diode s max rating Float Desired wavelength scan return velocity in nanometers sec nm s See Also SOURce WAVE SLEW RET
46. g 24 Getting Started 3 3 Parts List The following is a list of parts included with the Model 6700 Tunable Diode Laser 1 CD with Software Drivers and Utilities User s Manual Start Up Guide 2 IEC320 AC line cord with a NEMA 5 15P or country specific connector 3 Cable for controlling unit and laser head connection TLB 6700 01 4 USB Cable for connecting the controller to a computer 5 Spare fuses for 220 VAC 230 VAC and 240 VAC mains power If you are missing any parts or have questions about the parts you have received please contact New Focus 3 4 Choosing and Preparing a Suitable Work Surface The Model 6700 Tunable Diode Laser may be placed on any reasonably firm table or bench during operation 3 5 Electrical Requirements Before attempting to power up the unit for the first time the following precautions must be followed WARNING To avoid electric shock connect the instrument to properly earth grounded 3 prong receptacles only Failure to observe this precaution can result in severe injury e Have a qualified electrician verify the wall socket that will be used is properly polarized and properly grounded e Provide adequate distance between the Models 6700 Tunable Diode Laser and adjacent walls for ventilation purposes Do not let any other equipment blow hot air towards the Tunable Diode Laser Verify the correct rated fuses are installed according to the fuse marking on the rear panel The
47. ge The subsequent sections in this chapter detail the communication protocols supported by the instrument Computer Interface Terminology Listed below are the key abbreviations and concepts used in the command reference section of this manual lt gt Delimiting Punctuation For the purposes of this manual any string enclosed by lt gt is considered to be a command a string or numerical argument The punctuation lt gt is used to symbolize the typographic limits of the command string or argument in question lt CR gt Carriage Return The ASCII encoded byte 13 in decimal OD hex lt LF gt Line Feed The ASCII encoded byte 10 in decimal OA hex Computer Interfacing 5 2 4 Semicolons Semicolons are used to separate commands within a single transmission concatenation 5 2 5 Command Termination All the commands sent to the driver must be terminated by a lt CR gt lt LF gt sequence 5 2 6 Response Termination All the responses from the driver are terminated by a lt CR gt lt LF gt sequence 5 3 Controller Operation Mode The Tunable Laser Controller supports two modes of operation LOCAL and REMOTE The controller will be in LOCAL mode by default following a power reset In this mode all the main setpoints scan parameters and other system parameters can be adjusted by turning the control knob on the front panel of the controller Output can be turned ON and OFF by pressing the Laser Power b
48. gth is actively controlled using the tuning motor that rotates the end mirror When the tracking is turned OFF the laser runs open loop without active wavelength control Because of the nature of the wavelength control scheme however note that the wavelength of the laser is significantly more stable when the Track mode is turned OFF Argument Value Description Mode String or Integer 0 or OFF turns the Track mode OFF 1 or ON turns the Track mode ON See Also OUTPut TRACk SOURce WAVE Computer Interfacing 61 OUTPut TRACk Description Syntax Remarks See Also Wavelength Track mode query OUTPut TRACk This command returns the wavelength Track mode Response Description Value 0 wavelength Track mode is OFF 1 wavelength Track mode is ON OUTPut TRACk SOURce WAVE OUTPut SCAN START Description Syntax Remarks See Also Start wavelength scan process OUTPut SCAN START This command is used to start the wavelength scan process If the actual wavelength at the beginning of a scan is not equal to the starting wavelength the controller will move the laser to starting wavelength at return velocity Once the actual wavelength is at starting wavelength the controller starts the scan from starting wavelength to stopping wavelength at forward velocity When the wavelength has reached stopping wavelength the controller stops the scan process for a few milli seconds and starts scan from stopping to starting wavele
49. he main Menu using the UP DOWN navigation keys and changing the value by turning the knob control 34 System Operation 4 6 4 7 4 7 1 4 7 2 4 7 3 Wavelength Track Mode The wavelength track mode can be turned ON or OFF by navigating to the Lambda Track field in the main Menu using the UP DOWN navigation keys and changing the value by turning the knob control When the track mode is turned ON the laser wavelength is actively controlled using the tuning motor that rotates the end mirror When the tracking is turned OFF the laser runs open loop without active wavelength control Because of the nature of the wavelength control scheme however note that the wavelength of the laser is significantly more stable in Ready mode usually by 1 or 2 orders of magnitude than it is in Track mode Setting Wavelength Scan Parameters The laser cavity is carefully adjusted to give the best tuning performance when tuned from short to long wavelength Therefore when scanning the laser it is best to approach the desired wavelength from the short wavelength side All wavelength scan related parameters are accessible from Scan Parameters menu To view this menu first press the menu Setup Enter key and select Set Scan Params field using the UP DOWN navigation keys With this field selected press the Setup Enter key again or the RIGHT navigation key to enter the Scan Parameters menu Setting the Start and Stop Wavelengths
50. he parameter whose value needs to be modified using the Setup Enter and Cursor Arrow keys and then modify the values with the knob The knob has an acceleration algorithm that causes the rate of change of value to increase as the knob is turned faster Turning slowly allows for fine adjustment at the smallest displayed decimal place Setup Enter The Setup Enter key is used to a invoke the Setup screen b accept parameter change or c enter a lower menu level depending on the screen displayed 36 System Operation 4 10 3 4 10 4 4 10 5 4 10 6 Unselected USB Address 1 See item in e Save Settings v Esc The Esc key is used to a cancel a parameter change or b back up one menu level Cursor Arrow Keys Moves cursor UP or DOWN or between editable data fields The DOWN arrow decrements values in numerical entry fields or selects a previous choice in a multi choice entry field The UP arrow increments values in numerical entry fields or selects a next choice in multi choice entry fields The RIGHT and LEFT arrow keys are used to move the cursor position in numerical entry fields Display Elements The Model 6700 uses a character display to depict information about the current state of the system The display screens shown by the instrument can be classified as follows title screen laser head information screen main Setup screen parameter setup screen and error message screen Menu Selection
51. his command returns the magnitude of actual wavelength input voltage The resolution of this voltage is about 0 16mV Response Description Value Actual wavelength input voltage in Volts V See Also SENSe VOL Tage A UXiliary SENSe WAVElength Description Actual laser wavelength query Syntax SENSe WAVE length Remarks This command returns the magnitude of actual laser wavelength The value returned is same as that seen on the front panel of the controller at the time this command is executed Response Description Value Actual laser wavelength in nanometers nm See Also SENSe CURRent DIODE SENSe POWer DIODE Computer Interfacing 65 SOURce CPOWer Description Constant power mode set Syntax SOURce CPOWer Value Remarks This command enables disables Constant Power mode If the laser output is ON and a mode change is commanded e The output is turned OFF e The controller returns OUTPUT DISABLED DUE TO MODE CHANGE e The desired mode is set If the laser output is OFF and a mode change is commanded e The desired mode is set e The controller returns OK Argument Value Description Value OFF or 0 If the string OFF or 0 is specified as value the controller is set to Constant Current mode ON or 1 If the string ON or 1 is specified as value the controller is set to Constant Power mode See Also SOURce CPOWer SOURce CURRent DIODe Description Syntax Remarks See Also Diode laser current set SOU
52. hoosing and Preparing a Suitable Work Surface sese eee e 24 3 5 Electrical Requirement si sss sees ee eee eee eee 24 30 Power SUPPLIES cererii evades SY ZR cT 25 IT Quick Start enna a A an ANR NN 26 3 7 1 Connecting the Laser Component cee sese sees eee ee 26 3 7 2 Grounding and Powering the Laser System 27 3 7 3 Turning the Laser ON 27 3 7 4 Turning the Laser OHP sese 28 3 7 5 Software Installanion sss sese seer 28 4 System Operation 29 4 1 Description of Laser System sese ee eee 29 ALl 21115951 aaan a a G 29 42 R Head smie a eee 30 A Using the Front Pane ly scone ei aes sctbeees 32 K Setting Current e rensei e a a S 33 4 4 Setting Wavelength sees eee eee 33 4 5 Fine Wavelength Control sss sese eee 33 4 6 Wavelength Track Mode sss essen 34 4 7 Setting Wavelength Scan Parameters sees eee eee eee eee eee eee 34 4 7 1 Setting the Start and Stop Wavelengths sees eee 34 4 7 2 Setting the Scan Velocity ai cutie Aa esl Ces 34 4 7 3 gt Sex LS YT a SCAN C3525 easel r a as 34 4TA Stopping a SCAN ates see Selah ee to eae A ell 35 4 8 Laser Power DISDA sese eee eee 35 4 9 Wavelength E S 35 410 Ment Se OT eRe BENS ls Cs ees 35 4 10 1 Contool Knob eei a a a geelaterneascpeees 35 4 10 2 Setup S a 35 GIR ESC eara e Wate lua e sla E E A E sReseeae 36 4 10 4 Cursor Arrow Keys seene 36 4 10 5 Display Elements aici totais ope ternal pet anely 36 IRO Sele TS 36 410 7 MAE Sereen onamni ie a i e diete
53. iiai seam eoebadeu sea cetanbens 79 Gel References nenna T 82 7 Tips and Techniques 83 TN SIMIC U1 Thies ea E a aa sade eae aa anne ee 83 7 2 Grounding a Laser Head 4203 6 A ee es Ge 83 8 Maintenance and Service 85 Ol Enclosure Cleaning oniiir esien ieii 85 viii Preface 8 2 Techmcal SUpport asst ie chet tite ce Oa ace i a eee 85 8 3 PET VICE ssazisursncsidendaets T E E E E EEE R ERE 86 4 Obtaining Service 5 24 ahagsstahyanstensenacesncacesa e EE VEEE EE geedaahenuenseess 86 8 5 Warfanty T 86 OG L POr sseni e nna EE TTE 87 9 Appendix A Error Messages 89 ELL AMET O ULC UII TT 89 9 2 Error Deseripuon ara Gehlert ence nce 89 Preface ix List of Figures Figure 1 General Warning or Caution Symbol ccc eeeecceesseeeesteeeeneees 11 Figure 2 Electrical Shock Symbol sees eee 11 Figure o gt CE TT op escattys ate m oe ash oie ee aden Alas cae Stee aed aie Nastia ce 11 Figure4 Alternating Voltage SYmbol sees eee eee eee 12 Figure 5 On Symbolae innside eiin erer a i AE EAE 12 Figure 6 Off Symboler isese is ai a e is 12 Figure 7 PUse S ym Dol eimie aa ea ete Sie eR aitia 12 Figur sS USB Symbol heehee acess oa o e IE SSIR 13 Figure9 Frame or Chassis Terminal Symbol sss essen 13 Figure 10 WEEE Directive Svmbol sese eee eee 13 Figure 11 RoHS Compliant Svmbol sss sese 14 Figure 12 Rear Panel Labels and WaminRS esse eee eee eee 18 Figure 13 Controller Block Diagram sss sees sese 29 Figure
54. in the cavity passes through a collimating lens and then strikes a diffraction grating at near grazing incidence The beam is diffracted toward the tuning mirror which reflects the light back on itself for the reverse path Part of the light from the diode is reflected not diffracted by the grating This portion forms the output beam 80 Principles of Operation DC Motor Angle Sensor Output Beam Diffraction AR Grating Coating Control In gt Figure 27 New Focus Laser Cavity The grating functions as a narrow spectral filter Its passband is only a few gigahertz wide The high wavelength selectivity results because many lines of the grating are illuminated by the grazing incidence beam and because the beam is diffracted by the grating twice in each round trip through the cavity The grating spectral filter is narrow enough to force the laser to operate on only a single longitudinal mode Different wavelengths diffract off the grating at different angles However only one wavelength leaves the grating in a direction that is exactly perpendicular to the surface of the tuning mirror closing the resonant laser cavity It follows that we can tune the laser by changing the angle of the tuning mirror There is one very important innovation that allows the New Focus Velocity Tunable Diode Laser to tune continuously without mode hops In order to maintain resonance on the same mode as we tune the laser the number o
55. ion can result in severe injury WARNING Before cleaning the enclosure of the Model 6700 Tunable Diode Laser the AC power cord must be disconnected from the wall socket CAUTION There are no user serviceable parts inside the Model 6700 Tunable Diode Laser Work performed by persons not authorized by Newport Corporation will void the warranty For instructions on obtaining warranty repair or service please refer to Section 8 WARNING If this equipment is used in a manner not specified in this manual the protection provided by this equipment may be impaired Safety Precautions 17 WARNING While the Model TLB 6700 Controller s rear panel switch turns power OFF to the internal electronics it should not be depended upon to fully disconnect the unit from MAINS power Disconnect the power cord to fully isolate the Model 6700 from MAINS power WARNING The rear panel LASER CONTROL connector may have voltages as high as 150 VDC between various connector pins Do not power up the Model 6700 without a laser head connected WARNING Do not attempt to power up the controller if the cable between the controller and the laser head is damaged WARNING Use only New Focus Model Number TLB 6700 01 cable or New Focus approved alternative to connect the TLB 6700 controller to the 6700 series laser head WARNING Do not disconnect the cable between the Model 6700 and the laser head from the Model 6700 while the Model 67
56. ller Response Description Value String laser head serial number SYSTem LASer MODEL SYSTem LASer REV Description Syntax Remarks See Also Laser head revision number query SYSTem LASer REV This command returns the revision number of the laser head connected to the controller Response Description Value String laser head revision number SYSTem LASer SN SYSTem LASer CALDATE Description Syntax Remarks See Also Laser head calibration date query SYSTem LASer CALDATE This command returns the calibration date of the laser head connected to the controller Response Description Value String laser head calibration date SYSTem LASer SN 6 Principles of Operation 6 1 Theory of Design The New Focus 6700 series tunable lasers take advantage of the broad gain bandwidths available in semiconductor diode lasers In addition to being widely tunable the 6700 series lasers offer narrow linewidths This is accomplished by using a laser cavity design that began at the Massachusetts Institute of Technology The original resonators were an adaptation of dye laser designs New Focus has made key design modifications to adapt the cavity to the diode laser gain medium Our modified Littman Metcalf laser cavity is shown in 0 A high reflection coating on one end of the diode laser forms one end of the cavity and a highly reflective tuning mirror forms the other Starting from the diode the beam
57. ngth at return velocity If the wavelength Track mode is OFF the controller will automatically set this mode to ON at the beginning of scan The Track mode will remain ON at the end of scan completion The OPC command will return 0 while a scan is in progress Argument Value Description None OPC SOURce WAVE START SOURce WAVE STOP OUTPut SCAN STOP Description Syntax Remarks Stop wavelength scan process OUTPut SCAN STOP This command is used to stop the wavelength scan process The OPC command will return 1 once the scan is stopped Argument Value Description None 62 Computer Interfacing See Also OPC SOURce WAVE START SOURce WAVE STOP OUTPut SCAN RESET Description Syntax Remarks See Also Reset wavelength scan process OUTPut SCAN RESET This command is used to reset the wavelength scan process When this command is received by the controller it will stop the scan wait a few milli seconds and move the laser to starting wavelength The OPC command will return 1 once the scan is stopped Argument Value Description None OPC SOURce WAVE START SOURce WAVE STOP SENSe CURRent DIODe Description Syntax Remarks See Also Actual laser diode current query SENSe CURRent DIODe This command returns the magnitude of actual laser diode current The value returned is same as that seen on the front panel of the controller at the time this command is e
58. nput setting or remote command SYSTem WINPut The laser will immediately begin changing to the wavelength which corresponds to the voltage at the input The Wavelength Input connector accepts a DC signal between 0 and 10 V that corresponds linearly to the laser output wavelength in the same way as the Wavelength Output jack does The input impedance of this control is 27 k Q Note that an unconnected wavelength input corresponds to zero volts and the minimum wavelength If the maximum voltage is exceeded the diode laser will tune to its maximum wavelength and stop To exit Wavelength Input mode go to the Set System Params menu and set Wav Input parameter to OFF Also if you exit Track mode and then re enter the laser will still be in Wavelength Input mode Auxiliary Input The Auxiliary Input is a 16 bit analog to digital converter input to the digital signal processor DSP Analog signals that you connect here can be read out by your computer when you use remote control This is a general purpose input that allows you to collect data from a photodetector during a wavelength scan or for example to create your own Constant Power mode with an external detector The Auxiliary Input will accept signals from 0 to 5 volts and presents a 40 kQ load System Operation 47 4 12 Constant Power Mode Constant Power mode provides an easy way to remove the power modulation due to the talon effect caused by the residual facet reflec
59. nt If found to be defective during the warranty period the product will either be repaired or replaced at Newport s option To exercise this warranty write or call your local Newport office or representative or contact Newport headquarters in Irvine California You will be given prompt assistance and return instructions Send the product freight prepaid to the indicated service facility Repairs will be made and the instrument returned freight prepaid Repaired products are warranted for the remainder of the original warranty period or 90 days whichever occurs first Limitation of Warranty The above warranties do not apply to products which have been repaired or modified without Newport s written approval or products subjected to unusual physical thermal or electrical stress improper installation misuse abuse accident or negligence in use storage transportation or handling This warranty also does not apply to fuses batteries or damage from battery leakage THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE NEW FOCUS SHALL NOT BE LIABLE FOR ANY INDIRECT SPECIAL OR CONSEQUENTIAL DAMAGES RESULTING FROM THE PURCHASE OR USE OF ITS PRODUCTS First printing 2010 2010 by New Focus Santa Clara CA All rights reserved No part of this manual may be reproduced or copied without the prior written approval of New Focus
60. o earth ground It is strongly recommended that a single point ground scheme be established specifically at the binding post This will help minimize noise transients and ground loop hazards Be sure to include any signal generators in your ground circuit CAUTION Only one connection to ground is accepted Failure to do so may result in the unit malfunction and or damage Be careful when connecting other instruments to 6700 Tunable Diode Laser as they may have their ground connected to the Earth Ground For example oscilloscopes have the probe ground connected to Earth Ground If you have additional questions about your earth grounding method contact a New Focus applications engineer 84 Tips and Techniques This page is intentionally left blank 8 Maintenance and Service WARNING There are no user serviceable parts inside the Model 6700 Tunable Diode Laser Work performed by persons not authorized by Newport Corporation will void the warranty 8 1 Enclosure Cleaning WARNING Before cleaning the enclosure of the Model 6700 Tunable Diode Laser the AC power cord must be disconnected from the wall socket The source enclosure should only be cleaned with a mild soapy water solution applied to a damp lint free cloth Do not use an acetone or alcohol solution this will damage the finish of the enclosure 8 2 Technical Support Information and advice about the operation of any New Focus produc
61. ode laser is used as the gain medium One end of the diode laser has a high reflectivity coating which acts as an end mirror of the external cavity The other end of the diode has an antireflection coating The diode laser is bonded to a temperature sensor and a thermoelectric cooling block which maintains a highly stable diode temperature The laser beam radiating from the diode is collimated by a lens before striking a high quality diffraction grating The diffraction grating is precisely aligned at New Focus and its position is fixed with respect to the diode From the diffraction grating a fraction of the beam is directed to the tuning mirror The position of this mirror determines the operating wavelength of the laser The tuning mirror is mounted on a stiff arm An angle sensor near the pivot point of the arm provides data for wavelength readout The other end of the arm is moved by a DC motor driven screw and a piezoelectric transducer PZT The DC motor makes coarse wavelength changes while the PZT is used for micron scale movements which correspond to sub angstrom wavelength tuning precision The laser cavity is carefully adjusted to give the best tuning performance when tuned from short to long wavelength Therefore when scanning the laser it is best to approach the desired wavelength from shorter wavelengths A small fraction of the output beam is directed to a power monitor The reading from this monitor is displayed on the front
62. oie TT SO ose a a a eas ii Technical Support Contacts neisse eissa i a EA iv RIS Contents can a esai v TSO ISHER RE ERE E ix araa Gad Br 0 Con Ree eA Re E E EE EE TERTRE T ix 1 Safety Precautions 11 1 1 Definitions and Symbols ssc eee eee ee eee 11 1 1 1 General Warning or Caution sse eee eee ee ee eee eee eee 11 11 2 Electric Shock ns ato Sac Dacca crab e ts ee ek aceite 11 1 1 3 European Union CE Mark sese 11 1 1 4 Alternating Voltage Symbol sees 12 WS ON gn kueee Bedstead tek eet ee eee 12 KLO 9 T 12 LEP USCS T 12 1180 TOS os T 13 1 1 9 Frame or Chassis c csei tnecteek tienda lilies 13 1 1 10 Waste Electrical and Electronic Equipment WEEE 13 1 1 11 Control of Hazardous Substances sees eee eee eee 14 1 2 Warnings and atin s c2cs ge tis te pass ainda cats ates ees tenants 14 1 2 1 General Warnings sese ee eee eee eee eee eee 14 1 22 General Cattis nessis enatis 15 1 2 3 Summary of Warnings and CautiOonS sss sese sees eee 16 1 3 Location of Labels and WarmimngS sss sese eee 18 Lal Rear ST 18 2 General Information 19 Dah nroddu tO a R e a E aas 19 21 instrument 0 a 1 TT e a 20 22 AU PWET nieee naa Soden E ESPA AE REE ERE TRE r 20 E Spec IIT 21 2 3 1 Tenable Dode Laser oii 5 ase Ge Ae sede ae 21 2 3 2 G LT R Sre TTT 22 3 Getting Started 23 3 1 Unpacking and Handling 0 sss ss sees eee eee eee 23 vi Preface 3 2 Inspection for Damage sese sees seer 23 3 3 Parts Last T 24 3 4 C
63. oller REMOTE LOCAL operation mode query SYSTem MCONtrol This command returns the controller operation mode Response Description Value REM controller is in REMOTE mode LOC controller is in LOCAL mode SYSTem MCONtrol SYSTem WINPut Description Syntax Remarks See Also Wavelength input mode command SYSTem WINPut Mode This command is used to turn the wavelength input mode ON or OFF When the wavelength input mode is turned ON the laser wavelength is adjusted in proportion to the voltage at the wavelength modulation input Argument Value Description Mode Integer U turns the input mode OFF 1 turns the input mode ON SYSTem WINPut SYSTem WINPut Description Syntax Remarks See Also Wavelength input mode query SYSTem WINPut This command returns the wavelength input mode Response Description Value 0 wavelength input mode is OFF 1 wavelength input mode is ON SYSTem WINPut Computer Interfacing 77 SYSTem LASer MODEL Description Syntax Remarks See Also Laser head model number query SYSTem LASer MODEL This command returns the model number of the laser head connected to the controller Response Description Value String laser head model number SYSTem LASer SN SYSTem LASer SN Description Syntax Remarks See Also Laser head serial number query SYSTem LASer SN This command returns the serial number of the laser head connected to the contro
64. on the model The current modulation provided by this input is approximately 20 mA V To prevent damage to the diode laser the voltage swing on this input must be less than 1 Vp p CAUTION This is a direct RF connection to the laser diode Improper use could destroy the diode Do not exceed 1 V peak to peak input Avoid static discharge Since this is a direct connection to the diode laser there is no current limiter that prevents too much current from passing through the diode Thus there is a danger of destroying the diode if the maximum current is exceeded Be sure that the current modulation applied to the laser diode will not result in driving the diode above its maximum current See included Acceptance Test Data Sheet The high speed input has a protective shorting cap which should remain in place during normal operation When removing the shorting cap to connect a high frequency driver be sure to wear a ground strap to prevent static discharge Please contact New Focus if you have any questions on how to use the high speed modulation input Make sure to turn off power to the diode before connecting any device to the high speed input Wavelength Output The Wavelength Output BNC connector provides a signal from 0 to 10 V that corresponds linearly to the laser output wavelength This connection has 2 k Q output impedance Zero volts are output at the minimum operating wavelength for the laser head connected to the controller
65. ons 13 1 1 10 USB Figure 8 USB Symbol The symbol in the figure above identifies the USB connector location on the Model 6700 Tunable Diode Laser Frame or Chassis Figure9 Frame or Chassis Terminal Symbol The symbol in the figure above appears on the Model 6700 Tunable Diode Laser This symbol identifies the frame or chassis terminal Waste Electrical and Electronic Equipment WEEE Figure 10 WEEE Directive Symbol This symbol on the product or on its packaging indicates that this product must not be disposed with regular waste Instead it is the user responsibility to dispose of waste equipment according to the local laws The separate collection and recycling of the waste equipment at the time of disposal will help to conserve natural resources and ensure that it is recycled in a manner that protects human health and the environment For information about where the user can drop off the waste equipment for recycling please contact your local Newport Corporation representative 14 Safety Precautions 1 1 11 Control of Hazardous Substances RoHS Compliant Figure 11 RoHS Compliant Symbol This label indicates the products comply with the EU Directive 2002 95 EC that restricts the content of six hazardous chemicals 1 2 Warnings and Cautions The following are definitions of the Warnings Cautions and Notes that are used throughout this manual to call your attention to important information regarding you
66. r safety the safety and preservation of your equipment or an important tip WARNING Situation has the potential to cause bodily harm or death CAUTION Situation has the potential to cause damage to property or equipment NOTE Additional information the user or operator should consider 1 2 1 General Warnings Observe these general warnings when operating or servicing this equipment e Heed all warnings on the unit and in the operating instructions e Do not use this equipment in or near water e This equipment is grounded through the grounding conductor of the power cord Safety Precautions 15 1 2 2 Route power cords and other cables so that they are not likely to be damaged Disconnect power before cleaning the equipment Do not use liquid or aerosol cleaners use only a damp lint free cloth Lockout all electrical power sources before servicing the equipment To avoid fire hazard use only the specified fuse s with the correct type number voltage and current ratings as referenced in the appropriate locations in the service instructions or on the equipment Only qualified service personnel should replace fuses To avoid explosion do not operate this equipment in an explosive atmosphere Qualified service personnel should perform safety checks after any service General Cautions Observe these cautions when operating this equipment If this equipment is used in a manner not specified in this manual th
67. rature CA Vity Computer Interfacing 73 SOURce VOLTage PIEZo Description Piezoelectric transducer voltage setpoint query Syntax SOURce VOLTage PIEZo Remarks This query returns the piezo voltage setpoint Response Description Value Piezo voltage setpoint in percentage See Also SOURce VOLTage PIEZo SOURce WAVElength Description Laser diode wavelength setpoint query Syntax SOURce WAVElength Remarks This query returns the laser diode wavelength setpoint Response Description Value Laser diode wavelength setpoint in nanometers nm See Also SOURce WAVElength SOURce WAVE ACTSCANS Description Actual number of scans completed query Syntax SOURce WA VE ACTSCANS Remarks This query returns the actual number of scans completed during the last scan process Response Description Value Actual number of scans See Also SOURce WAVE DESSCANS SOURce WAVE DESSCANS Description Desired number of scans query Syntax SOURce WAVE DESSCANS Remarks This query returns the desired number of scans to be performed by the controller once a scan process is started Response Description Value Desired number of scans See Also SOURce WAVE DESSCANS 74 Computer Interfacing SOURce WAVE SCANCFG Description Syntax Remarks See Also Scan configuration query SOURce WA VE SCANCFG This query returns the scan configuration setting Response Description Value Scan configur
68. reinstalling the drum Do not attempt to rotate the drum while it is inserted in the power entry module You risk bending the power contacts and render the unit inoperable After correctly setting the voltage selection switch the fuses installed in the power entry module should be checked for the correct value and if not correct changed Table 1 below identifies the correct voltage selector switch setting and fuse ratings for several common AC power Input Power Voltage Switch Setting Fuses 100 VAC 50 Hz 100 2A 250VAC Slo Blo 120 VAC 60 Hz 120 2A 250VAC Slo Blo 220 VAC 50 Hz 230 1A 250VAC Slo Blo 230 VAC 50 Hz 230 1A 250VAC Slo Blo 240 VAC 60 Hz 240 1A 250VAC Slo Blo Table 1 Voltage Selector Switch Settings and Fuse Ratings 26 Getting Started WARNING With the power entry module open the voltage selector switch setting can be changed by removing the drum rotating it to the desired setting and reinstalling the drum Do not attempt to rotate the drum while it is inserted in the power entry module Failure to observe this procedure will result in equipment damage WARNING AN To avoid electric shock connect the instrument to properly earth grounded receptacles only Failure to observe these precautions can result in fire severe injury or death WARNING To avoid electric shock the appropriate fuses for the AC input power voltage must be installed in the in
69. ress SETUP ENTER key to accept the new value The new parameters will take effect immediately and the menu item will be returned to idle state Press Esc key to cancel any changes or to return to Set System Params main menu Save Settings Menu The Save Settings menu item is used to store the instrument s setup configurations for future use For example a specific test setup may be saved for later use and then another setup may be used presently When the user desires to perform the specific test its setup is simply recalled Non volatile flash memory is used for saving the instrument s parameters When a save operation is performed all of the parameters which are currently in effect on the instrument are stored The user selects a bin number for saving the parameters up to the maximum available in the instrument Then when that bin number is recalled the instrument is reconfigured to the previously stored values A special bin 0 is reserved for the reset state Recalling bin 0 will reset the unit to factory defaults System Operation 41 4 10 10 3 To perform the save operation use the UP and DOWN arrow keys to select this menu item Press the SETUP ENTER key to enter a sub menu for this item A sample sub menu for setting the system parameters is shown in figure below Bin Number 1 Push Enter to Save Figure 22 A Sample Save Parameters Sub menu Use the UP arrow key to select the Bin Number Press
70. returns to zero falling edge to this input is equivalent to depressing and releasing the Scan button Stopping a Scan If you push the Scan button in the middle of a scan or a reset it will stop leaving you in Ready mode Laser Power Display There is a 4 digit 7 segment display on the controller s front panel that is dedicated for displaying the actual laser current or power This displayed value depends upon the mode of operation Actual laser current is displayed and mA LED is turned ON when the controller is in Constant Current mode The display can also show the laser power The mW LED is turned ON when the controller is in Constant Power mode The ERROR LED located below this display will be turned ON solid RED if the laser output has been turned OFF by the controller due to any safety violation If the laser output current reaches the programmed limit the LIMIT LED will be turned ON blinking YELLOW to indicate that any further Set Current increase will be limited Wavelength Display The actual laser wavelength is shown in the 6 digit 7 segment display on the controller s front panel Menu Section In addition to displaying status parameters on the two 7 segment LED displays of the instrument the Menu section of front panel enables users to view change many more parameters Control Knob The control knob on the right side of the front panel is used to set the value of all parameters Users can select t
71. rporation Calling Procedure If there are any defects in material or workmanship or a failure to meet specifications promptly notify Newport s Returns Department by calling 1 800 222 6440 or by visiting our website at www newport com returns within the warranty period to obtain a Return Material Authorization Number RMA Return the product to Newport Corporation freight prepaid clearly marked with the RMA and we will either repair or replace it at our discretion Newport is not responsible for damage occurring in transit and is not obligated to accept products returned without an RMA E mail rma service newport com When calling Newport Corporation please provide the customer care representative with the following information Your Contact Information Serial number or original order number 6 Description of problem i e hardware or software To help our Technical Support Representatives diagnose your problem please note the following conditions Is the system used for manufacturing or research and development What was the state of the system right before the problem Have you seen this problem before If so how often Can the system continue to operate with this problem Or is the system non operational Can you identify anything that was different before this problem occurred Preface V Table of Contents EU Declaration of Conformity sss de was sese eee eee Sew eee aetna se wis i Maa
72. s of warm up time is recommended for best performance The AC Power switch is the on off for the whole unit including the laser head The Laser Power button controls the laser output When you push the Laser Power button it flashes for a 3 second safety delay and then lights up to indicate that current is flowing through the diode laser in the laser head unit This allows you to set up all the desired operating parameters with the AC Power on but while the laser is not generating light Parameters can be modified by either turning the control knob or by using the navigation keys You can set the desired parameter by pushing the RIGHT navigation key until the cursor arrives under the digit you need to change System Operation 33 Push the up down key to change the digit value After setting all the digits to the desired values push the Setup Enter button to accept the desired parameter 4 3 Setting Current Power The New Focus Velocity Tunable Diode Laser is designed to run on a single longitudinal mode The system is typically set so that the drive current is below the threshold of multimode operation Under these conditions the current display is continuously on However it is possible to increase the drive current in order to increase the output power The trade off is that there is increased risk of multimode operation The current settings for multimode operation may be wavelength dependent Please refer to the included Accep
73. strument Only qualified service personnel should replace fuses Failure to observe these precautions can result in fire severe injury or death 3 7 Quick Start This section outlines the basic steps needed to start using your 6700 Series External Cavity Tunable Diode Laser including a brief setup and getting started guide It assumes that earlier sections regarding safety and AC input power settings have been read For more detailed information on how to operate the instrument refer to Chapter 4 System Operation 3 7 1 Connecting the Laser Components Connect the Model TLB 6700 Controller to the 6700 series laser head using the TLB 6700 01 or other approved New Focus Cable Secure the screw locks on the connectors at both ends of the cable WARNING Use only New Focus Model Number TLB 6700 01 cable or New Focus approved alternative to connect the TLB 6700 controller to the 6700 series laser head Getting Started 27 WARNING Do not disconnect the cable between the Model 6700 Controller and the laser head while the Model 6700 Controller is powered up WARNING Secure the connector screwlocks at both ends of the cable between the Model 6700 and the laser head 3 7 2 Grounding and Powering the Laser System Verify that the line voltage setting on the rear of the Model TLB 6700 Controller matches your MAINS power Verify that the proper fuses are installed See Section 3 6 above for details Connect the binding
74. t is available from our technical support engineers For quickest response ask for Technical Support and know the model and serial number for your product Hours 8 00 5 00 PST Monday through Friday excluding holidays Toll Free 1 866 NUFOCUS 1 866 683 6287 from the USA amp Canada only Phone 408 284 6808 Support is also available by fax and email Fax 408 980 4300 Email techsupport newfocus com We typically respond to faxes and email within one business day Maintenance and Service 8 3 Service Your 67XX series laser has been designed to provide years of trouble free operation Virtually no maintenance is required except for ensuring that the unit is not damaged contaminated or used in an unsafe manner 8 4 Obtaining Service The Model 6700 Tunable Diode Laser contains no user serviceable parts To obtain information regarding factory service contact New Focus or your New Focus representative Please have the following information available 1 Instrument model number on the rear panel 2 Instrument serial number on rear panel or bottom of enclosure 3 Description of the problem If the instrument is to be returned to New Focus you will be given a Return Number which you should reference in your shipping documents Please fill out a copy of the service form located on the following page and have the information ready when contacting Newport Corporation Return the completed service form with th
75. tance Test Data Sheet for actual settings To set the desired Current Power level press Mode button to select desired laser diode mode of operation constant current or constant power Use the UP DOWN navigation keys to select Current Power field in the main Menu display Turn the knob control to set the desired Current Power setpoint 4 4 Setting Wavelength The desired wavelength can be adjusted by first navigating to the Lambda field in the main Menu using the UP DOWN navigation keys and changing the value by turning the knob control The maximum and minimum wavelengths that can be set depend upon the head rating If the wavelength Track Mode is ON changing the wavelength setpoint will automatically cause the DC motor to move the end mirror until the new wavelength is reached 4 5 Fine Wavelength Control The Piezo Voltage is used for fine sub angstrom wavelength tuning A piezoelectric transducer PZT is used to make adjustments in the tuning mirror angle that are too small to be made by the DC motor The readout is in percent of the maximum PZT voltage from 0 to 100 The Piezo Voltage control can change the wavelength over a several angstrom range which is easily seen on a wavemeter of sufficient accuracy If however the laser is in Track mode the DC servo motor will counteract the piezo and the wavelength will change relatively little To change the Piezo voltage setting first navigate to the Piezo field in t
76. the SETUP ENTER key to change the Bin Number menu state from idle to active Once the item is in active state use the cursor keys to select the desire bin number Press SETUP ENTER key to accept the desired bin Now use the DOWN arrow key to select the menu item that states Press Enter to Save Press SETUP ENTER key with this menu item selected to save the system settings to the bin number selected earlier The instrument will automatically return to the Measurement screen once the saving process has completed Recall Settings Menu The Recall Settings menu item is used to recall previously saved instrument s setup configurations Recalling bin O will reset the unit to factory defaults To perform the recall operation use the UP and DOWN arrow keys to select this menu item Press the SETUP ENTER key to enter a sub menu for this item A sample sub menu for recalling the system parameters is shown in figure below Bin Number 1 Push Enter to Rcl Figure 23 A Sample Save Parameters Sub menu Use the UP arrow key to select the Bin Number Press the SETUP ENTER key to change the Bin Number menu state from idle to active Once the item 42 System Operation 4 10 10 4 is in active state use the cursor keys to select the desire bin number Press SETUP ENTER key to accept the desired bin Now use the DOWN arrow key to select the menu item that states Press Enter to Rcl Press SETUP ENTER key with this menu item sel
77. the product and in Warning and Caution tables throughout this document This symbol designates that documentation needs to be consulted to determine the nature of a potential hazard and any actions that have to be taken A Figure2 Electrical Shock Symbol Electric Shock The Electrical Shock Symbol in the figure above appears throughout this manual This symbol indicates a hazard arising from dangerous voltage Any mishandling could result in irreparable damage to the equipment and personal injury or death European Union CE Mark CE Figure3 CE Mark Safety Precautions The presence of the CE Mark on Newport Corporation equipment means that this instrument has been designed tested and certified compliant to all applicable European Union CE regulations and recommendations Alternating Voltage Symbol ow Figure 4 Alternating Voltage Symbol This international symbol implies an alternating voltage or current On Figure5 On Symbol The symbol in the figure above represents a power switch position on the Model 6700 Tunable Diode Laser This symbol represents a Power On condition Off O Figure6 Off Symbol The symbol in the figure above represents a power switch position on the Model 6700 Tunable Diode Laser This symbol represents a Power Off condition Fuses oo Figure 7 Fuse Symbol The symbol in the figure above identifies the fuse location on the Model 6700 Tunable Diode Laser Safety Precauti
78. the value of various laser operating conditions Note that there is an important difference between Sense Commands and Source Queries Sense Commands read actual voltages currents temperatures or wavelengths the value returned is the same as that seen on the controller front panel at the time the command is executed In contrast Source Queries read set points values that are theoretical goals These values may not necessarily match the values displayed on the front panel For instance the queried diode current and piezo voltages can differ from the actual values by up to 3 due to component variations such as resistor tolerances However in the case of wavelength queries the wavelength set by a Source Command will match the wavelength returned by a Source Query because each laser is factory calibrated and has its specific wavelength calibration table loaded into the laser head The next section has an index of all the possible computer control commands Then the pages that follow the index of commands give detailed information about each command including a description of the command and examples of how the command is used Computer Interfacing 5 5 3 Index of Commands Standard Commands Syntax Description IDN Identification string query RCL Recall controller settings RST Reset the controller SAV Save controller settings STB Query status byte OPC Query oper
79. tivity when scanning the wavelength or to stabilize the laser power to minimize long term power drift A digital feedback loop is implemented in the firmware to keep the laser power at a set level by controlling the laser current Because of the relatively long loop time 10 ms we recommend using this mode with a scan speed under 1 of the maximum speed To enable and disable Constant Power mode select accordingly via front panel menu options After leaving this mode the power setting is stored in memory 48 System Operation This page is intentionally left blank 5 5 1 5 2 5 2 1 5 2 2 5 2 3 Computer Interfacing Introduction The Model 6700 Tunable Laser Controller has a USB interface to receive commands from and send responses to a host PC The commands supported by the controller can be divided into the following two categories commands that cause it to take a desired action and commands queries that cause it to return a stored value Query commands must end with a question mark It is recommended that when a query command is sent the response to that command from the instrument be read before issuing any other command Set commands on the other hand are used to configure setup the controller for a desired mode of operation These commands take at least one parameter If the controller executed the command successfully it responds with an OK string Otherwise it returns an error messa
80. to a piezoelectric fine tuning element in the laser head By using the PZT system you can tune the wavelength smoothly with sub angstrom precision The Motion Control module actuates the DC motor which provides coarse wavelength control and scanning For smooth tuning a DSP is used to generate desired motion trajectory and to perform PID feedback control of the DC motor The DSP based digital board controls all of the other modules runs the digital displays and provides USB interfacing capability It also communicates with the circuit board in the laser head to determine what kind of laser head it is and to upload the wavelength calibration table Laser Head The laser head embodies a simple ultra stable design which is shown below Everything is mounted on a solid metal base and enclosed in a sealed package You will never need to open the laser head to operate the laser Unauthorized opening of the laser head will void the warranty System Operation 31 Current Detector Input Modulation Input Frequency Controller Wavelength Input Modulation Input Tuning Wavelength DC Motor Mirror Sensor Output Angle Sensor Front Panel Controls O Q Remote Local Diffraction AR Grating Coating High Speed Current Modulation Input to 100 MHz gt Lontrol In up Tonton gt Figure 14 Laser Head Mechanical Schematic forTLB 6700 series laser In this design a di
81. turns the display brightness setting Response Description brightness Display brightness in percentage See Also BRIGHT ERRSTR Description Error string query Syntax ERRSTR Remarks This query returns a single error code along with the corresponding error text string that occurred since the last error query Refer to Appendix A for a list of error codes and strings generated by the instrument Response Description Error code text Error code and text for error code as per chapter 0 if no errors See Also ERRors LOCKOUT Description Lockout the instrument front panel Syntax LOCKOUT Value Remarks This command can be used to lockout all the buttons and dial knob or just the dial knob on the front panel Computer Interfacing 59 Argument Value Description Value 0 Front panel buttons and dial knob enabled 1 Front panel buttons and dial knob disabled 2 Front panel dial knob disabled See Also None LOCKOUT Description Instrument front panel lockout state query Syntax LOCKOUT Remarks This query returns the instrument s front panel lockout state Response Description Value Front panel lockout state See Also LOCKOUT ONDELAY Description Laser turn on delay command Syntax ONDELAY time Remarks This command controls the laser turn on delay This is the amount of time between the moment the laser on command is received and the moment the output is actually energized This setting is also used when a laser is
82. urn SOURce CPOWer Description Constant Power mode query Syntax SOURce CPOWer Remarks This query returns the Constant Power mode setting See Also Response Description Value 0 Constant Current mode 1 Constant Power mode SOURce CPOWer 72 Computer Interfacing SOURce CURRent DIODe Description Syntax Remarks See Also Diode laser current setpoint query SOURce CURRent DIODE This query returns the diode laser current setpoint Response Description Value Diode laser current setpoint in milliamperes mA SOURce CURRent DIODe SOURce POWer DIODe Description Syntax Remarks See Also Diode laser output power setpoint query SOURce POWer DIODE This query returns the diode laser output power setpoint Response Description Value Diode laser power setpoint in milliwatts mW SOURce POWer DIODe SOURce TEMPerature DIODe Description Syntax Remarks See Also Diode temperature setpoint query SOURce TEMPerature DIODe This query returns the diode temperature setpoint Response Description Value Diode laser temperature setpoint in degC C SOURce TEMPerature DIODe SOURce TEMPerature CAVity Description Syntax Remarks See Also Cavity temperature setpoint query SOURce TEMPerature CAVity This query returns the laser cavity temperature setpoint Response Description Value Laser cavity temperature setpoint in degC C SOURce TEMPe
83. urrent limit set point 514 LDD MODE The Laser Diode Driver subsystem output has been turned CHANGE OFF because a mode change was commanded using SOURce CPOWer command or through front panel interface 524 LDD OVER TEMP The Laser Diode Driver subsystem output has been turned OFF because the internal heatsink temperature has exceeded safe levels Please allow the unit to cool down before turning the output ON again 803 WAVE OVER TEMP The Wavelength control subsystem output has been turned OFF because the internal heatsink temperature has exceeded safe levels Please allow the unit to cool down before turning the wavelength tracking ON again 802 WAVE FOLLOW Wavelength tracking has been turned OFF because the ERROR difference between actual wavelength and wavelength setpoint exceeded 2nm Please reduce the scan speed setting and turn wavelength tracking ON again 804 PIEZO OVER TEMP The piezo control subsystem setpoint has been changed to 0 because the internal heatsink temperature has exceeded safe levels Please allow the unit to cool down before changing the piezo setpoint again 805 CMD NOT This error is generated when the command received by SUPPORTED the controller is not supported by laser head connected to it 902 KEY ENABLE OFF This error is generated when user tries to turn the Laser Diode Driver subsystem output ON with key switch in OFF position 919 LASER This error is generated when user tries to turn the Laser
84. utton Please refer the System Operation chapter for a detailed description on how to accomplish these tasks When it is in REMOTE mode knob control is disabled setpoints and other settings can be adjusted only by issuing appropriate commands from a host PC The REMOTE or LOCAL status indicator character can be found in the LCD display The controller can be put into REMOTE mode by issuing the command SYSTem MCONtrol REM It can be put back in LOCAL mode by issuing SYSTem MCONtrol LOC command 5 4 USB Communication The instrument is designed to communicate with a host PC via a standard USB interface Before connecting the instrument to the USB interface the user should install the application included in the software CD that accompanies the Tunable Laser Controller The application automatically installs the right USB drivers Communication can be done through this interface by using the application or by developing software in the user s preferred programming language The software CD contains communication drivers and example programs in the following programming languages LabVIEW and C NET Computer Interfacing 51 5 5 5 5 1 5 5 2 Commands Summary Conventions There are two types of device commands commands that cause the instrument to take a desired action and queries that return a stored value or state of the instrument Queries must end with a question mark while commands may require paramet
85. x velocity SOURce WAVE SLEW FORWard Query wavelength scan forward velocity SOURce WAVE SLEW RETurn Query wavelength scan return velocity System Commands Syntax Description SYSTem ENTIME Query laser usage time SYSTem MCONtrol Set controller operation mode SYSTem MCONtrol Query controller operation mode SYSTem WINPut Set wavelength input mode SYSTem WINPut Query wavelength input mode SYSTem LASer MODEL Query laser model number SYSTem LASer SN Query laser serial number SYSTem LASer REV Query laser revision number SYSTem LASer CALDATE Query laser calibration date Computer Interfacing 55 5 6 Commands and Queries IDN Description Identification string query Syntax IDN Remarks This query will cause the instrument to return an identification string Model Firmware Firmware Controller Name Version Date Serial ae ae Sa SS AU SL NEW_FOCUS XXXX vYYY mm dd yy SNZZZZ RCL Description Recall command Syntax RCL Bin Argument Value Description Bin 0 Restores factory default settings 1to5 Restores settings saved in specified bin Remarks This command restores the instrument to the setup states saved in instrument s non volatile flash memory The parameters that can be restored are USB address Beeper enable state LCD display brightness Dial rotary knob lockout state Laser mode Diode current setpoint
86. xecuted Response Description Value Actual laser diode current in milliamperes mA SOURce CURRent DIODE SOURce CURRent DIODE SENSe POWer DIODe Description Syntax Remarks See Also Actual laser diode power query SENSe POWer DIODe This command returns the magnitude of actual laser diode output power The value returned is same as that seen on the front panel of the controller at the time this command is executed Response Description Value Actual laser diode output power in milliwatts mW SOURce POWer DIODE SOURce POWer DIODE Computer Interfacing 63 SENSe TEMPerature DIODe Description Syntax Remarks See Also Actual laser diode gain element temperature query SENSe TEMPerature DIODe This command returns the magnitude of actual laser diode gain element temperature Note that the diode temperature is actively controlled If the room temperature ever gets so high that the coolers have insufficient capacity to reduce the temperature the control loop can become unstable and destroy the cooling elements To prevent damage the laser is automatically shut down if the laser diode gain element temperature exceeds 35 C Response Description Value Actual laser diode gain element temperature in degC C SOURce TEMPerature DIODe SOURce TEMPerature DIODe SENSe TEMPerature CAVity Description Syntax Remarks See Also Actual laser cavity temperature query SENSe TEMPer

TLB-6700 User Manual Rev D

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