SWL7500 User Manual Rev1
Contents
1. Argument X X range 0 0 to 300 0 units are in mA Example Set the diode current to 88 8 mA SOUR CURR 88 8 Query Diode Current Setpoint Syntax SOURce CURRent SWL 7500 ECDL Controller Actions Queries the diode current setpoint Response xmA range 0 0 to 160 0 Example Read the setpoint for the diode current SOUR CURR gt 99 3mA Sense Diode Current Syntax ENSe CURRent SWL 7500 Series Laser User s Guide Computer Control 31 32 Computer Control SWL 7500 ECDL Controller Actions Returns the laser diode current reading Response x xmA range 0 0 to 180 0 Sense Laser Temperature Syntax 5 ENSe T EMPerature SWL 7500 ECDL Controller Actions Returns the laser temperature reading Response x xC range 7 0 to 47 0 New Focus Customer Service Service The SWL 7500 series laser is designed as a maintenance free laser thus there are no scheduled service actions If your laser does require service repair or calibration please call for a Return Authorization Number before shipping the unit to Bookham Technical Support Information and advice about the performance or operation of your SWL 7500 series laser is available from our applications engineers For quickest response ask for Technical Support and have your model and s2. position fully clockwise The system will start up with the current set to 0 mA After turning the keyswitch allow the system a minimum of 20 minutes to reach a stable temperature before performing any critical work Once the keyswitch is turned on the system can be operated remotely through the USB or RS 232 ports Refer to the Computer Control chapter beginning on page 19 for details To prevent damage to the laser diode the factory has limited the maximum current to the operating current listed on the Acceptance Test Data Sheet Activate the laser Push the Laser On button to activate the laser power The button will flash for 5 seconds as mandated by the US FDA before current flows through the diode The Laser On indicator light in the button will remain lit while the laser is emitting light Laser light should now be emitted from the aperture Laser radiation emitted from this unit may be harmful Avoid direct exposure to the beam Turn the laser off To minimize the risk of power surges damaging the laser diode push the Laser On button to turn off the laser when it is not in use and before shutting down the system Turn the keyswitch off fully counter clockwise to shut down the entire system The status LED should remain lit and green indicating that there is power being supplied to the controller and the diode is being temperature regulated New Focus General Operation Overview The SWL 7500 seri
3. AVOID EXPOSURE NO 50 dtd une 28 2007 VISIBLE LASER RADIATION 3 AVOID DIRECT EXPOSURE BEAM 450 mW MAXIMUM OUTPUT CW OPERATION AlGalnP DIODE LASER CLASS Ilib LASER PRODUCT Figure 2 Labels on the INVISIBLE LASER CLASSI LASERPRODUCT RADIATION IS 2584 Junction Avenue San Jose CA 95134 1902 USA EMITTED FROM THIS APERTURE INVISIBLE LASER RADIATION i AVOID DIRECT EXPOSURE TO BEAM 450 mW MAXIMUM OUTPUT CW OPERATION AlGaAs DIODE LASER CLASS Ilib LASER PRODUCT AVOID EXPOSURE top of the fiber coupled P and free space optically isolated Ol laser heads Is THIS APERTURE LASER LIGHT EMITTED FROM Model Number Serial Number Wavelength Power Manufacture Date ST New Focus M 2584 Junction Avenue San Jose CA 95134 1902 USA SWL 7500 P LASER LASER LIGHT AVOID DIRECT EXPOSURE TO BEAM 450 mW MAXIMUM OUTPUT CW OPERATION AlGalnP DIODE LASER CLASS ilib LASER PRODUCT Complies with 21 CFR 1040 10 and 1040 11 except for deviations pursuant to Laser Notice No 50 dated June 24 2007 Model Number Serial Number AVOID EXPOSURE Wavelength SWL 7500 Series Laser User s Guide INVISIBLE LASER EMITTED FROM THIS RADIATION IS Power APERTURE Manufacture Date New Focus 2584 Junction Avenue San Jose CA 95134 1902 USA 9 SWL 7500 P LASER INVISIBLE LASER RADI
4. Day Year Query Instrument Operating Hours Syntax SYSTem INFormation SHOurs SWL 7500 ECDL Returns the system operating time Controller Actions Response x Hrs range 0 to 65536 7 5 years Query Laser Head Manufacturing Date Syntax SYSTem INFormation HMANufacture SWL 7500 ECDL Returns the date of laser head manufacture Controller Actions Response mm dd yy Month Day Year SWL 7500 Series Laser User s Guide Computer Control 29 30 Computer Control Query Laser Head Operating Hours Syntax SYSTem INFormation DHOurs SWL 7500 ECDL Controller Actions Returns the laser head operating time Response xxxxxHrs range 0 to 65536 7 5 years Query Laser Head Wavelength Syntax SYSTem INFormation HWAVelength SWL 7500 ECDL Controller Actions Returns the nominal head wavelength Response x xx nm New Focus System Commands Turn Laser On Off Command Syntax OUTPut lt value gt SWL 7500 ECDL Controller Actions Turns the laser head on or off Argument 0 for laser current off and 1 for laser current on Example Turn off power to the laser OUTP 0 Current Diode Commands Set Diode Current Syntax SOURce CURRent lt current gt SWL 7500 ECDL Controller Actions Sets the diode current setpoint
5. Download link You will be prompted to save the following file SWL 7500_ECDL_Controller_GUIzip zip Create a folder in C Program Files named New Focus Unzip the file to this folder Create a shortcut to the SWL 7500 ECDL Controller exe file you extracted from the zip file and place it in a convenient location such as your desk top Connect either an RS 232 or USB cable between your computer and the SWL 7500 ECDL Controller You can only upgrade the firmware through the RS 232 cable but this is rarely necessary Turn the keyswitch on the laser front panel clockwise to the ON position Double click the SWL 7500 ECDL Controller exe file or the shortcut you created in step 5 The following screen will appear SWL 7500 Series Laser User s Guide Computer Control 19 New Focus SWL 7500 ECDL Controller View Firmware Laser Head Communication pn ew Focus Laser Off Laser Current ees na 86 m Diode Temperature SEST I e 20 4 C 9 Select the proper communication port Choose Communication gt Configure Serial New Focus SWL 7500 ECDL Controller View Firmware Laser Head n 7 Configure Serial P ew Focus Laser Current Diode Temperature 20 4 Cc 10 Depending on your communication method select one of the following Control Ports from the Serial Port Configuration Control Port drop down list 20 Computer Control pore Focus New Focus SWL 7500 ECDL Contro
6. Wiring pe New Focus Index B beam height 14 bracket mounting 14 C computer control 19 command definitions 29 command summary 28 controller front panel controls 15 current modulating 17 F front panel controls 15 H heatsinking 14 height beam 14 help servicing the laser 33 technical support 33 I IEEE computer control 19 inputs current modulation 17 interlock safety 8 isolation optical 14 K keyswitch 16 L labels safety 6 local mode 15 M modulating current 17 mounting bracket 14 mounting the laser head 14 O optical isolation 14 P power maximum diode powers 6 Index 1 turning on the laser 16 R remote mode 15 RS 232 computer control 19 wiring diagram 39 5 safety interlock 8 safety labels identifying 6 servicing the laser 33 support technical 33 T technical support 33 temperature considerations heatsinking 14 warming up 16 turning on the laser 16 W warming up the laser 16 wavelength ranges by model number 6 wiring diagram RS 232 connector 39 42 Index TT o New Focus
7. a new line character is received Numbers may contain at most 15 characters Commands that expect integer values will truncate after any decimal point in the input For example an input value of 11 56 is truncated to 11 Only one command can be issued per line SWL 7500 Series Laser User s Guide Computer Control 27 Command Summary System Information Queries Syntax Command Page SYST INF SMAN Instrument Manufacturing Date 29 SYST INF HMAN Laser Head Manufacturing Date 29 SYST INF SHO Instrument Operating Hours 29 SYST INF DHO Laser Head Operating Hours 30 SYST INF HWAV Laser Head Wavelength 30 System Commands Syntax Command Page OUTP lt power gt Turn On Off Power to the Laser Head 31 Current Diode Commands Syntax Command Page SOUR CURR lt current gt Set Diode Current 31 SOUR CURR Query Diode Current Setpoint 31 SENS CURR Sense Diode Current 31 SENS TEMP Sense Laser Temperature 32 Power Laser Commands Syntax Command Page OUTP lt power gt Turn On Off Power to Laser Head 31 28 Computer Control o New Focus Command Definitions System Information Queries Query Instrument Manufacturing Date Syntax SYSTem INFormation SMANufacture SWL 7500 ECDL Returns the date of system manufacture Controller Actions Response mm dd yy Month
8. laser current and or Thermo Electric Cooler TEC are operating correctly To view the status of the laser choose View gt Status New Focus SWL 7500 ECDL Controller MES Firmware Laser Head Communication Laser On Errors About Laser Current A ete ah as m Diode Temperature ey E E 20 4 Cc The following screen will appear indicating that the laser is operating correctly If an error condition exists the radio buttons will be red SWL 7500 ECDL Controller Status Operating Time 0 00 05 Diode Temperature Ele Ae TEC Status Laser Current 85 m Laser Status SWL 7500 Series Laser User s Guide Computer Control 23 24 Computer Control You can query the SWL 7500 ECDL Controller firmware version by choosing Firmware gt Version New Focus SWL 7500 ECDL Controller Laser On Laser Current Sy a 86 m Diode Temperature SWL 7500 ECDL Controller Firmware fi New FOCUS Version 0 0 1 0 Manufacture Date 10 29 08 Diode Temperature Ifyou are using a USB cable to communicate with your laser and you need to update the firmware under normal operating conditions this will not be necessary you must first connect to the laser through the RS 232 port and set the communications port properly as shown above Then choose Firmware gt Update A Windows dialog box will New Focus open Locate and select the new Firmware version The Firmware update will procee
9. 00 Series Laser User s Guide General Operation 5 cycling the power will eliminate the error condition and the laser will return to a normal operating mode If the user is communicating with the laser through the computer interface the green LED will flash although this usually happens too quickly to observe as the commands and information that can be passed back and forth are communicated rapidly The status LED indicates that the laser is plugged in and will be green regardless of the status of the Laser On button or the keyswitch position as long as power is supplied to the laser controller USB Connector Insert a standard USB mini connector cable here and insert the other end into a Windows based PC for computer control of the laser Only a single USB cable or an RS 232 cable needs to be used for computer control of the laser Rear Panel 5 Laser Head This connects directly to the laser head Use only the New Focus supplied 15 to 26 pin connector cable 5V Power input from the standard switching power supply or other 5V source See Figure 4 on page 11 RS 232 Insert a standard RS 232 cable here and insert the other end into a Windows based PC for computer control of the laser Only a single USB cable or an RS 232 cable needs to be used for computer control of the laser Interlock BNC Laser safety interlock used to prevent laser emission in fault conditions such as unauthorized entry into room The system is supp
10. ATION gt AVOID DIRECT EXPOSURE TO BEAM 450 mW MAXIMUM OUTPUT CW OPERATION AlGaAs DIODE LASER CLASS lb LASER PRODUCT Complies with 21 CFR 1040 10 and 1040 11 except for deviations pursuant to Laser Notice No 50 dated June 24 2007 User Safety 7 Using the Safety Interlock The safety interlock connector on the back of the SWL 7500 ECDL Controller is provided for external safety systems The system is shipped with a jumper across the interlock Do not remove this BNC jumper unless you are using the safety interlock feature the laser will not emit light unless the interlock circuit is closed The circuit carries 3 3 V DC 8 User Safety prow Focus Getting Started Introduction This section outlines the basic steps needed to start using your SWL 7500 series laser system including brief set up and starting notes For more detailed information on how to operate the instrument refer to the General Operation chapter beginning on page 13 Unpacking the System Carefully unpack the SWL 7500 series laser system Compare the contents against the packing slip and inspect them for any signs of damage If parts are missing or you notice any signs of damage such as dented or scratched covers please contact Bookham immediately The packaging is designed to accommodate a free space laser head and a fiber coupled laser head Both compartments will be filled only if you ordered two laser heads Save t
11. Computer Control New Focus A Use Query commands to check the user or factory set values of the laser Examples include checking the set value for the current and checking the number of hours of operation Use Sense commands to determine the actual values for the laser properties at any given time For example to check the actual operating current Sense and Query commands evoke a response from the controller There is no response from Set commands if they are accepted and properly executed Conventions The following pages contain a summary of all available commands followed by detailed definitions for each command The following conventions are used in both the Command Summary and the Command Definitions sections The part of the command shown in uppercase represents the short form of the command The commands are case insensitive If the syntax shown is SOURce CURRent then the SWL 7500 ECDL Controller will accept any of the following SOUR CURR sour curr or sour current The controller will not accept commands such as SOURC CURR or sour curre Values to be input are indicated by angle brackets lt gt and are separated from the command either by a space or by a colon as shown in the command syntax Programming for the SWL 7500 ECDL Controller When programming for the SWL 7500 ECDL Controller keep the following rules in mind A command is not parsed until
12. TM USER S GUIDE SWL 7500 Series Single Wavelength External Cavity Diode Laser U S Patents 6 556 599 Use of controls or adjustments or performance of procedures other than those specified herein may result CAUTION in hazardous radiation exposure 1 New Focus 2584 Junction Ave San Jose CA 95134 1902 USA phone 408 919 1500 e mail contact newfocus com gt www newfocus com Warranty Bookham guarantees its New Focus SWL 7500 Single Wavelength Laser series to be free of material and workmanship defects for one year from the date of shipment or 5 000 to 6 000 hours of operation depending on the model whichever comes first This warranty is in lieu of all other guarantees expressed or implied and does not cover incidental or consequential loss Please note that each SWL 7500 series laser is custom built to the user s exact wavelength specifications Because of the custom nature of this product returns are accepted only within 30 days from the date of purchase and are subject to a restocking fee of 65 of the original cost Products described in this document are covered by U S Patent 6 556 599 Information in this document is subject to change without notice Copyright 2009 Bookham All rights reserved NEW FOCUS the Bookham Inc logo New Focus and all Bookham Inc names and slogans are trademarks or registered trademarks of Bookham Inc in the U S A and other countries Litte
13. all plug appropriate for your country Alternatively you can supply the unit directly with a low noise 5 V DC 4 A max Refer to Figure 4 for connection information The controller power input port was designed to accept a Kycon San Jose CA KPPX 4P connector Figure 4 pi F Power Cord Connection shell TTT P2 P4 PIN P1 P2 P3 P4 shell wire NC 5V DCreturn shield This is a view of the plug that must be constructed not of the receptacle in the controller 5 Optically isolate the laser Take precautions to prevent back reflections into the laser head Isolation can be achieved by angling your optics or with the use of an optical isolator The degree of isolation required depends on how you are using the laser contact New Focus technical support for help with your particular application If your laser head is fiber coupled P option or optically isolated OI option then your system already has an optical isolator within the laser head Starting the SWL 7500 Series Laser for the First Time This section takes you through the basic steps of starting up and shutting down the laser The controls and functions are described in more detail in the following chapter SWL 7500 Series Laser User s Guide Getting Started 11 Figure 5 SWL 7500 ECDL Controller Front Panel 12 Getting Started Laser On gt lt Turn on the system Turn the keyswitch to the ON
14. d automatically You can view the current and factory set laser head parameters by choosing Laser Head gt View Parameters New Focus SWL 7500 ECDL Controller View Firmware IEE ash Communication lt go N Factory Defaults Laser Current gn aS 86 m A N Diode Temperature nay I SOA AE E 20 4 JE A screen similar to the one shown below will appear showing information about the laser head SWL 7500 Series Laser User s Guide Computer Control 25 SWL 7504 ECDL Head Parameters New Focus Model Number SWL 7504 Serial Number BOG Manufacture Date 1173 2008 Wavelength 633 0 nm Operation Time 0 hours Diode Polarity Sink Factory Default Diode Temperature 20 4 C Minimum Diode Temperature 20 0 C Maximum Diode Temperature 25 0 C Diode Temperature Setpoint 20 4 C Maximum Laser Current 86 m Laser Current 86 m Direct Communication With the Laser Communication with the laser is also possible by directly addressing the serial or USB ports The following section provides a guide to the usable command set Make sure to address the correct serial port when issuing commands directly Understanding the Command Types There are three types of commands understood by the SWL 7500 ECDL Controller Set commands Query commands and Sense commands Use Set commands to set or change a value Examples would be commands that turn on the laser head or set the operating current 26
15. d the warranty and may result in misalignment of the laser cavity and or irreparable damage to the internal components WARNING The following table contains a list of wavelength ranges and maximum internal powers accessible inside the different model laser heads Look at the label on top of your laser head for its model number and its specific wavelength All models have P fiber coupled D head only and OI free space optically isolated options Model Wavelength Range Max Power SWL 7504 632 5 640 nm 50 mW SWL 7505 650 660 nm 50 mW SWL 7509 675 695 nm 50 mW SWL 7513 SWL 7513 H 765 790 nm 450 mW The actual output power of your laser will only be a fraction of the internal diode power shown here Your laser will only operate at one specific wavelength within that model s wavelength range Fiber coupling will reduce the output of your laser by roughly half Label Identification The aperture and danger labels shown here pertain to different wavelength laser heads Depending on your specific wavelength requirements other labels similar to those shown may be used 6 User Safety prow Focus Figure 1 Labels on the front top and side of the free space laser head AVOID EXPOSURE LASER LIGHT IS EMITTED FROM THIS APERTURE Power Model Number Serial Number Wavelength Manufacture Date Complies with 21 CFR 1040 10 and 1040 11 except for
16. erial number available The model and serial number can be read from the top of the laser head label Hours 8 00 5 00 PST Monday through Friday excluding holidays Toll Free 1 866 NUFOCUS 1 866 683 6287 ext 4091 from the USA amp Canada only Phone 408 919 1500 ext 4091 Support is also available by email Email techsupport newfocus com We typically respond to email within one business day SWL 7500 Series Laser User s Guide Customer Service 33 A 34 Customer Service New Focus Appendix Physical Specifications Controller SK RAGA n PA La SWL 7500 ECDL ce A 7 o New Focus A Dimensions in inches Controller Weight 1 3 Ibs SWL 7500 Series Laser User s Guide Appendix I Physical Specifications 35 Free Space Laser Head 2X 2 20 ti yo AVOID EXPOSURE INVI R LX 8 2 0 00 2 50 1 80 LASER BEAM CENTER 2 20 00 00 m ey v 09 1 20 090 O logo 00 5 5 gt gt gt 1 20 2 00 2 40 Dimensions in inches Weight o
17. es laser is a robust narrow linewidth laser source The system consists of a power supply laser controller a laser head and a laser cable Each laser head contains head specific information so that it can be used with any laser controller This modular design allows you to switch wavelengths simply by changing the laser head heads are available separately The system can be operated manually using the front panel controls or remotely using one of the computer interfaces What s Inside The SWL 7500 series laser is an external cavity diode laser ECDL based on a patented resonator design The customer selected wavelength is set and stabilized at the factory using internal optics and precision temperature control Laser output power is controlled by an ultra low noise current source The controller contains the electronics for laser current and laser temperature control and monitoring as well as digital interface electronics A dimensional drawing of the controller is located in Appendix I Physical Specifications on page 35 The temperature of the laser cavity is set at the factory for optimum laser performance and should not under normal circumstances be adjusted by the user although you can read the temperature using the computer interface see Computer Control on page 19 The laser current controls the optical output power This can be adjusted by using the computer interface but should be left at the factory set
18. f Free Space Laser Head 1 lb 0 5 kg 36 Appendix I Physical Specifications pe New Focus Fiber Coupled and Optically Isolated Laser Head 2X 3 20 y y LX R14 2x 29 N A F IBER 00 1 35 r pales oY 2X 65 Dimensions in inches The free space optically isolated model OI option does not have the fiber as shown in the illustration Weight of Fiber Coupled and Optically Isolated Laser Head 2 Ibs 1 kg SWL 7500 Series Laser User s Guide Appendix I Physical Specifications 37 38 Appendix I Physical Specifications pe New Focus Appendix II RS 232 Connector Wiring RS 232 9 Pin D Connector The RS 232 connector on the back of the SWL 7500 ECDL Controller is a standard female 9 pin D connector The laser controller transmits data on pin 2 and receives data on pin 3 see below If you have trouble communicating with the laser over the RS 232 port you may need to use a null modem adapter or cable Figure 8 6 7 8 9 RS 232 Female Pin Name Description 9 Pin D Connector 1 Not Connected __ OOOO 2 Tx Serial Transmit Line 3 Rx Serial Receive Line 4 Not Connected 1 2 4 Ground Digital Ground Line 6 9 Not Connected SWL 7500 Series Laser User s Guide Appendix II RS 232 Connector Wiring 39 40 Appendix 11 RS 232 Connector
19. he shipping container and packing material for future shipping needs SWL 7500 Series Laser User s Guide Getting Started 9 Setting Up the Laser Figure 3 Controller to Laser Head Connection 10 Getting Started 1 Mount the laser head The laser head is shipped with a mounting bracket already attached This bracket also serves as a heatsink to avoid overheating the laser head Mount the laser head bracket in a stable position with the output aperture pointing towards an appropriate beam block Output beam height is one inch See page 14 for details on mounting techniques Position the controller Position the controller within a cable length of the laser head about five feet The controller keyswitch should be off fully counter clockwise Connect the head and controller Connect the controller to the laser head with the 26 pin to 15 pin D connector laser cable provided see Figure 3 Use only the supplied New Focus laser cable to connect the controller to the laser head To ensure proper and safe operation of the laser secure the cable to the laser head and controller using the captive attachment screws in the cable s D connectors D Connector Laser Cable New Focus 4 Connect the power cord Attach the power cord to the controller and plug it into a wall outlet This laser utilizes a low noise switching power supply It should work at any normal line voltage You should have been provided with a w
20. lfuse and Slo Blo are registered trademarks of Littelfuse Inc Document Number PA004037 Rev 1 2e o New Focus Contents User Safety 5 Introduction oaen eae coud Rot he teeing See ee i 5 Laser Safety e 02 ct ena anale es eee rae 5 Using the Safety Interlock 2020 8 Getting Started 9 2 2 0 ENEWS EE BESS 9 Unpacking the System 2202002220 9 Setting Up the Laser pure seam ha awe 10 Starting the SWL 7500 Series Laser for the First Time 11 General Operation 13 OVErV EW 0 0 3 Whats1biside on GN aD As 13 Mounting the Laser Head 14 Using the Front and Rear Panel Controls 15 Turning on the 6 20 e ee eee ee nee 16 Modulating the Laser Output 17 Computer Control 19 Using the SWL 7500 ECDL Controller GUI Control Prostas eer eue eaea A a a 19 Direct Communication With the Laser 26 Understanding the Command Types 26 Conventions eh seeen neie eisie AAA 27 Command Summary LL 28 Command Definitions 29 SWL 7500 Series Laser User s Guide Contents 3 Customer Service 33 SEN iaia VR ey te alaa 33 Technical Support 0 33 Appendix I Physical Specifications 35 35 Free Space Laser Head 5 36 Fiber Coupled and Optically Isolated Laser Head 37 Appendix II RS 232 Connector Wiring 39 RS 232 9 Pin D Connector 0 0 eee eee 39 Index 3 4 e Contents prow Focus User Safet
21. lied with an interlock defeat connector The interlock circuit is powered by a 3 3 V DC voltage Turning on the Power To turn power on to the SWL 7500 series laser 16 General Operation 1 Turn the power keyswitch on the front panel to the full clockwise position Wait at least 20 minutes after turning on the keyswitch to allow the laser head to reach a stable temperature before acquiring valid data New Focus 3 Press the Power button on the controller front panel to allow current to flow to the laser head The button will flash during the five second safety delay before the current is activated The button will remain lit while current is flowing to the laser diode The diode will not emit laser light until the current is set high enough to meet the threshold current Before turning off the system you should first turn off power to the laser diode by pressing the Laser On button Modulating the Laser Output The SWL 7500 series lasers allows you to modulate the current and hence the frequency of the laser For current modulation use the high speed SMA input on the back of the laser head Figure 7 Location of High Speed Current Modulation Input Modulating the Current Since changes in the current affect the laser frequency you may want to modulate the current in order to achieve fine frequency modulation The frequency modulation is due to changes in the index of refraction of the laser gain mediu
22. ller View Firmware Laser Head Communication Help SWL 7500 ECDL Controller Serial Port Configuration Control Port Leon A OL Laser Current Diode Temperature EA OA Neue en os c RS 232 Select the Com Port you have physically chosen on your computer e USB N A You can now control the laser from your computer e Click 1 to turn the laser on After a five second safety delay mandated by the US FDA the laser will emit light The GUI will change to show Laser On New Focus SWL 7500 ECDL Controller View Firmware Laser Head Communication ew Focus Laser On Laser Current i oe ace ai 86 m Diode Temperature VT ae 20 4 Cc e Click the Laser On Off button again to turn off the laser SWL 7500 Series Laser User s Guide Computer Control 21 While the laser will be operating at its optimum current and temperature you can now adjust these parameters It is advised that all of your work with the laser be performed at the factory default settings In order to return the laser to its factory default settings choose Laser Head gt Factory Defaults or use the control panel to set the parameters manually New Focus WL 7500 ECDL Controller View Firmware IES Communication 7 View Parameters El Factory Defaults Laser On Laser Current Diode Temperature BPN es EA A 20 4 Cc 22 Computer Control pe New Focus You can view the status of the laser This view will indicate if the
23. m the semiconductor diode as a function of laser current The degree to which the current affects the wavelength depends on the specific laser head you are using but it is in the range of 25 150 MHz mA SWL 7500 Series Laser User s Guide General Operation 17 1 Turn off and unplug the diode power the light in the Power button should be off Failure to turn off the diode power before connecting the RF input could destroy the laser diode WARNING 2 Connect the line for the input signal to the SMA connector on the back of the SWL 7500 laser head Make sure the signal conforms to the following specifications Connector Type Current Modulation Input Guidelines SMA Max Voltage 1 Vp p Input Frequency Range 50 kHz 100 MHz Impedance 50Q Modulation 20 mA V This is a direct RF connection to the laser diode Improper use could irreparably damage the diode Do not exceed the I V _ WARNING 18 General Operation input and use standard precautions for static discharge when using this input New Focus Computer Control Using the SWL 7500 ECDL Controller GUI Control Program You can control the SWL 7500 series Single Wavelength Lasers through a graphical user interface which is downloadable from the New Focus website To download install and configure the GUI 1 Go to http www newfocus com index cfm navid 36 and click on the SWL 7500 Software
24. optimum current under most circumstances 1 U S Patent 6 556 599 SWL 7500 Series Laser User s Guide General Operation 13 Mounting the Laser Head Proper mounting of the laser head is essential for stable wavelength operation The output wavelength is weakly dependent on the temperature of the laser cavity which is actively stabilized using a thermoelectric cooler TEC The TEC utilizes the laser head housing as a heat reservoir For this reason the mount for the laser head needs to provide a good thermal path away from the laser head The attached mounting bracket included with each laser head provides such a path when it is in contact with a large thermal mass such as an optical table The laser head can be mounted with or without the enclosed mounting bracket shipped attached to the laser head Dimensional drawings of the laser head and the mounting bracket are shown in Appendix I on page 36 The mounting bracket is designed for use with metric 25 mm spacing M6 or English one inch spacing 1 4 20 breadboards If you are mounting the laser head without the included mounting bracket take steps to ensure it has an adequate thermal heat sink Beam Height The laser beam height is one inch 25 4 mm from the bottom of the mounting bracket Optically Isolating the Laser After mounting the laser head take precautions to prevent back reflections into the laser aperture Isolation can be achieved by angling your optic
25. s or with the use of an optical isolator The degree of isolation required depends on how you are using the laser contact New Focus technical support for help with your particular application If your laser head is fiber coupled P option or optically isolated OI option then your system already has an optical isolator within the laser head 14 General Operation New Focus Using the Front and Rear Panel Controls Control of the SWL 7500 ECDL laser system is designed to be simple and straightforward Figure 6 Controller front and rear panels 6 60 Laser On a Interlock 0000 0 0 6 Laser Head RN RS 232 ce 9 Front Panel 1 Laser Keyswitch Locks out the ability to turn the laser on Power is delivered to all functions of the laser except the diode if the keyswitch is turned off The laser will not operate with the keywsitch in the counter clockwise position The key is not removable in the on clockwise position Laser On Push Button Current to the diode is delivered to the laser when this button is pushed The Laser On indicator light in the button will remain lit while the laser is emitting light Status LED If the laser is in a normal operating mode it will be green and continuously on If the system is in an error state the LED will be red Information about the error can be obtained through the computer interface although in most cases simply SWL 75
26. y Introduction Your safe and effective use of this product is of utmost importance to us at Bookham Please read the following laser safety information before attempting to operate the laser Laser Safety The laser radiation emitted from this unit may be harmful Always follow these precautions Avoid direct exposure to the beam Avoid looking at the beam directly Be aware of and follow the warnings on the safety labels examples are shown on page 7 and page 7 The laser will exhibit a five second delay before emitting light after pressing the on switch as mandated by the US FDA The keyswitch must be turned to the full clockwise position to turn on the laser The laser will not operate in the counter clockwise position The key cannot be removed from the controller when it is in the clockwise on position To completely shut off power to the unit turn off the keyswitch and unplug the unit The Power button on the front of the controller controls power to the laser diode even when the power to the diode is off power is still being supplied to the laser head for temperature control SWL 7500 Series Laser User s Guide User Safety 5 Do not open the laser head or controller Diode laser power at the wavelengths shown in the following table could be accessible inside the laser head There are no user serviceable parts inside the laser head or controller Unauthorized opening of the head or controller will voi
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