Advanced Laser Diode Systems
Contents
1. 13 4 3 5 Laser diode C rrent cree eee Dee dente to ert 14 4 3 6 Setting laser diode current limit 15 4 4 Thermoelectric cooler controller ssseseenn 17 4 4 1 Temperat re setting eee eto eren 17 4 4 2 Setting temperature limits eeessssssssssseseeeeenennenennennen nennen 18 4 4 3 Setting temperature control loop parameters eee 19 444 Cooler Settings 28 niae PR Rt le e aae de e ae des 20 4441 Select cooler uia ced as vet e de e n ied tete 20 4 4 4 2 Select sensor eE a Lese La dee acce ea eee 21 4 4 4 8 Setting cooler current limit 22 4 5 Instru mentsettings x 22e Ed ree ELE Seo eda EET eto er eben ee Pb zoe et 23 45 1 Interlock i o oe eee UU e OE ac ber tee eI 23 4 6 Error Messages ooi e Ei ee Ed de ap Een ae lecto etur Renee 24 Connectors DIn oHl tie deeem e eio etie ee baies nna 26 5 1 Easer di dei iu ee ene e fa od ebay Sei na deer E PARE ert S 27 5 2 Thermoelectric cooler 1 enne nnne nnn 28 5 3 Thermoelectric cooler 2 sssssssssssssssssssss eene nennen enne nnne 29 54 unterloekeossete De fec pU LM m eA EE 30 5 5 Serial Interface ien dei ied are o n portentis dore oet iso ate de EEG 31 Interfaces command description eeeeeeeennnnnenn 32 6 1 Serial Interface coii ne ERR n Haa eee ee Eun 32 SpechtlCatlons c n 36 1 General The informatio2. This instrument must be used under normal conditions and as specified otherwise the protection provided by the instrument could be impaired Always replace blown fuses with the same rating and acting speed ESD Electrostatic discharge ESD on or near the connectors can damage electronic devices inside the instrument Personnel should touch the metal frame of the instrument for a second before touching any connector 1 4 Laser Safety 1 5 Laser Classification This laser system is classified as laser class 4 product according to EN 60825 1 2001 Please note that the used laser diodes are laser class 4 Please contact your laser safety commissioner for necessary safety instructions and equipment Laser light emitted by class 4 laser diodes are dangerous for the human eye and skin General warning label for laser radiation at cooler block Label for relevant parameters of the Label for Laser Class 4 at cooler block laser diode for normal operation and its statements at cooler block Average radiant power Po Wavelength laser radiation A Label for indicating laser emitting aperture or cooling block due to lack of Space Use caution to avoid hazardous exposure to the beam Take precautions to eliminate exposure to a direct or reflected beam Do not look directly into the beam of the laser diode under conditions which exceeds the specified limits Never observe the laser beam through optical instruments 1 6 System con
3. N Note The value for the temperatures the upper and lower temperature limits must be within OC to 50C 33 Specific associations Laser operating mode set LMO v Following associations of parameter values to be typed in are valid Laser operating mode o CW NO TIME LIMIT Default 1 CW TIME LIMIT 2 PULSE NO TIME LIMIT PULSE TIME LIMIT Get condition laser get LAS Following associations of values which will be returned are valid Condition laser diode o Laser diode off Set condition laser set LAS The command for setting the condition turning on or turning off of the laser diode has a toggle function Each time the command set LAS is sent out the condition of the laser diode changes For example if the laser diode is presently turned off as for example when the DioPower is just Switched on with the Power switch the laser diode will be turned on when the command set LAS is sent out On the other hand if the laser diode is presently turned on and the command set LAS is sent out the laser will be turned off Therefore we recommend to use the following programming structure First get the condition of the laser diode whether it is turned on or turned off with the command get LAS Depending on the returned value and the desired action by the user the decision to send the command set LAS should be done Enable parameters set AIE v The value for setting a enable paramete
4. Do not switch on the instrument yet Plug in the dummy connector DP Con Interlock to the appropriate connector at the rear side of the instrument as described in the section Connectors pin out This dummy connector provides a closed loop for the interlock feature Installation of the laser diode Connect the laser diode to the leads of the provided cable DP Cable LD as described in the section Connectors pin out Plug in the cable to the connector labeled Laser at the rear panel of the instrument Fix the connector with the locking ring Note The instrument must be turned off before the cable is plugged in ESD Electrostatic discharge ESD on or near the connectors can damage electronic devices inside the instrument Personnel should touch the metal frame of the instrument for a second before touching any connector Laser diodes are extremely sensitive to electrostatic discharge Follow the instructions supplied with the laser diode very carefully Installation of the thermoelectric cooler HeatSink Connect the thermoelectric cooler and the temperature sensor to the leads of the provided cable DP Cable TEC TS as described in the section Connectors pin out Plug in the cable to the connector labeled Cooler at the rear panel of the instrument Fix the connector with the locking ring Note The instrument must be turned off before the cable is plugged in 4 Operation After installation of the laser diode the thermoelect
5. actual temperature and the desired temperature Due to the large heat capacity and heat load of high power laser diodes and the needed heatsinks it takes some minutes until a stable operating point is reached 19 4 4 4 Cooler settings 4 4 4 4 Select cooler The DioPower can work without with one or with two cooler controllers Before working the appropriate cooler must be enabled Attention Before you enable a cooler make sure that the DioPower was purchased with the appropriate cooler controller see Delivery Note the correct sensor type is connected on the correct connector see section Connectors pin out the correct sensor type is selected by software see section Select sensor the appropriate cooler current limit is set see section Setting cooler current limit How to enable or disable the coolers Starting from the MAIN menu press the Select key to get to the SELECT menu SELECT LASER TIMING TEMPERATURE Press the Up or Down key to select the COOLER SETTINGS sub menu Confirm the selection with the Enter key SELECT SETTINGS LASER CURRENT LIMIT TEMPERATURE SETTINGS COOLER SETTINGS INTERLOCK SETTINGS Press the Up or Down key to select the SELECT COOLER sub sub menu Confirm the selection with the Enter key COOLER SETTINGS SELECT SENSOR COOLER CURRENT LIMIT Press the Up or Down key to select the cooler to be changed Change the setting between ENABLE and DISABLE with the R
6. current The duration of the operation is not time limited internally The laser diode is turned on with the Laser key The laser diode is turned off by pressing the Laser key again The laser diode is operated with a pulsed current The high level current is set with the Rotary knob see section Laser diode current The duration of the operation is time limited according to the setting by the user see section Pulse and timing operational mode The duration of the operation time is given after the mark The laser diode is turned on with the Laser key The laser diode is turned off by pressing the Laser key again v v sec indicates a value and the unit of the time duration How to set the laser diode operational modes Starting from the MAIN menu press the Select key 2 to get to the SELECT menu SELECT LASER TIMING TEMPERATURE SETTINGS Press the Up or Down key 2 to select the LASER sub menu Confirm the selection with the Enter key 2 SELECT EXTERNAL INPUTS Press the Up or Down key to select LASER MODE sub sub menu Confirm the selection with the Enter key SELECT MODE CW TIME LIMIT PULSE NO TIME LIMIT PULSE TIME LIMIT Press the Up or Down key to select the desired mode Confirm the mode with the Enter key The display automatically returns to the MAIN menu 12 4 3 3 Pulse and timing operational mode How to set the laser diode pulse and timing operational modes Starti
7. heatsink consists of a heat spreader on which the laser diode is mounted several peltier elements for heat transportation and a large heatsink profile with fans for sufficient air flow The unit consists of several modules The heart is a microprocessor based central unit which controls all other power units and provides the link to the display keyboard and the PC interfaces All parameters can be set with only a few push keys and a rotary knob and are shown on the display Additionally the parameters can be set and controlled via an interface to a PC For driving the laser diodes the DioPower uses a constant voltage power supply which is followed by a sophisticated designed current controlling stage For driving the thermoelectric cooler a separate high efficient power supply is used The DioPower provides maximum laser diode protection by using AC line filtering transient suppression soft start short circuiting of the output when switched off and setting of permanent current and temperature limits 3 Installation Please read the whole operating instructions before using this instrument together with a laser diode Installation of the instrument Before installation check the local mains voltage The instrument is equipped with auto ranging power supplies for a continuous input voltage from 93 to 132 and 180 to 264 V AC 9 50 60 Hz If the primary fuses are blown these can easily be replaced by the user Connect the instrument to the mains
8. optical power is also within a specified range How to set the laser diode current 14 To set the laser diode current first go to the MAIN menu If necessary the MAIN menu can be selected by pressing the Select 2 key several times The desired laser diode current is set with the Rotary knob 3 within the MAIN menu Turning clockwise increases the value turning counter clockwise decreases the value The selected current can be read in the upper right corner of the display after the letters lse e g 144245 5A The maximum possible value is limited to the maximum set current as described in section Setting laser diode current limit The laser diode is turned on by pressing the Laser key 4 and the desired current is applied to the laser diode The lighting yellow LED 3 nearby the Laser key indicates that the laser diode output is turned on The actual current that is applied to the laser diode is displayed in the middle of the MAIN menu The current applied to the laser diode can also be varied when the laser diode is turned on by modifying the desired current with the Rotary knob 3 within the MAIN menu For example CW TL NO _Isget 45 5A 45 5A T1225 0 To na The laser diode is turned off by pressing the Laser key 4 again Notes The laser diode current is always set automatically to zero when the instrument is switched on The laser diode is always in a turned off condition after the instrument is swi
9. the laser diode To Cooler 2 actual temperature optional na not available The laser diode is turned on with the Laser key 4 4 3 2 Laser diode operational modes The display usually shows the following window the MAIN menu CW TL NO _Iser 0 0A 0 0A The operational mode should only be changed when the laser diode is turned off Nevertheless when changing the operational mode the laser diode is turned off automatically 11 The following four operational modes can be selected and combined CW TL NO CW TL v v sec PU TL NO PU TL v v sec Note The laser diode is operated with a continuous current The duration of the operation is not time limited internally The current is set with the Rotary knob see section Laser diode current The laser diode is turned on with the Laser key The laser diode is turned off by pressing the Laser key again The laser diode is operated with a continuous current The duration of the operation is time limited according to the setting by the user see section Pulse and timing operational mode The duration of the operation time is given after the mark The current is set with the Rotary knob see section Laser diode current The laser diode is turned on with the Laser key The laser diode is turned off automatically after the indicated time The laser diode is operated with a pulsed current The high level current is set with the Rotary knob see section Laser diode
10. two optional built in controllers for thermoelectric coolers Cooler 1 is usually used for cooling the laser diode and delivered up to 10A 15V The cooler 2 is optional and is used for customized applications e g laser crystal cooling It delivered up to 3A 5V If a cooler is enabled see section Select cooler the appropriate temperature controller immediately starts operating after switching on the instrument The temperature controller attempts to set the approptriate cooler temperature to the desired temperature which may take up to several minutes depending on the difference of the actual temperature and the desired temperature Due to the large heat capacity and heat load of medium power and high power laser diodes and the needed heatsinks it may take some minutes until a stable operating point is reached The actual temperatures of cooler 1 usually the laser diode and cooler 2 optional are displayed in the lower line of the MAIN menu 0 0A T 225 0 To na Ti Cooler 1 actual temperature usually the laser diode To Cooler 2 actual temperature optional na not available The desired temperatures are stored permanently in a non volatile memory even when the instrument is switched off Note The output of the thermoelectric controllers are bipolar that means they can cool and heat Trouble shooting After preparing the connection of the thermoelectric coolers and the temperature sensors according to the sec
11. 4 4 2 Setting temperature limits The operating laser diode and also the optional custom application should be protected by operating setting temperature limits according to the specific datasheet provided by the manufacturer If the temperature of cooler 1 or cooler 2 providet they are enabled are out of the selected range the laser diode and the cooler controller are turned off automatically and an error message appears on the display see section Error messages How to set the temperature limits Starting from the MAIN menu press the Select key to get to the SELECT menu SELECT LASER TIMING TEMPERATURE Press the Up or Down key to select the TEMPERATURE SETTINGS sub menu Confirm the selection with the Enter key SELECT SETTINGS LASER CURRENT LIMIT EMPERATURE SETTINGS COOLER SETTINGS INTERLOCK SETTINGS Press the Up or Down key to select the SELECT sub sub menu Confirm the selection with the Enter key SELECT EMP1 PARAMETERS TEMP2 PARAMETERS Press the Up or Down key to select TEMP1 PARAMETERS or TEMP2 PARAMETERS Confirm the selection with the Enter key 18 SET TEMP1 PARAMETERS 30 0 LOWER LIMIT 10 06 P 40 5 D 0 Press the Up or Down key to select the parameter to be changed Change the value of the selected parameter setting with the Rotary knob Confirm the value with the Enter key Get back to the MAIN menu by pressing the Select key four times The values of the tempera
12. Advanced Photonic Systems APhS GmbH LA Schwarzschildstr 6 Phe Center AZ a vanc ed a AR NA D 12489 Berlin Germany lt A Tel 49 0 30 6392 6520 Photonic Fax 49 0 30 6392 6521 e mail info aphs de S J4 S f ems A website http www aphs de D CW QCW Laser Diode and Thermoelectric Cooler Controller DioPower Operating Instructions Rev 1 6 March 2003 Manual English DioPower 50 Contents cl en 4 11 Warranty and ASSISTanCce s iiie Erie ieee Lise laa oiera eed 4 1 2 Maintenance s ee d e up d A ER dee ES tete 4 1 8 General Safety Considerations essen 4 TA Laser Satety M c 5 1 5 Laser Classifications cuc ed tin Od teed hea ee 5 1 6 Systerm contents tti edet ute ave dee ora be Le i t eee stunts 6 Hpiigersjtioi o Mere 7 Meee a E T eeu 8 Operaatio t 9 4 1 Elements of the instrument at the front panel sssssssssseeeee 9 4 2 Elements of the instrument at the rear panel sssssssssssesse 10 4 3 Laser diode controller eene 11 4 3 1 Instrument switch on display MAIN menu cece eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeneeeas 11 4 3 2 Laser diode operational modes ssssseeeeenen eene 11 4 89 3 Pulse and timing operational mode seseeeeeneen 13 4 3 4 External analogue modulation and triggering of the laser diode
13. TEMPERATURE SENSOR 2 NOT DETECTED SHORTED In order to return to the MAIN menu the error massage must be confirmed by pressing the Enter key After the DioPower detects the temperature sensor again the temperature controller starts working again according to the parameters as before the error occurred The laser diode must be turned on again by pressing the Laser key If the error is still present the error message appears again after the Laser key is pressed Remarks The error concerning the temperature sensor also appears if the connector for the thermoelectric cooler and the temperature sensor also named connector for the HeatSink is not connected to the instrument Before providing this connection the DioPower has to be turned off Temperature range error If the temperature of a cooler is out of the range as defined with the temperature limits in section Thermoelectric cooler controller the laser diode and the thermoelectric coolers are turned off immediately One of the following messages appears on the display 24 ERROR ERROR TEMPERATURE 1 TEMPERATURE 2 OUT OF RANGE OUT OF RANGE In order to return to the MAIN menu the error massage must be confirmed by pressing the Enter key After the laser diode reaches the allowed temperature range again the laser diode can be turned on again by pressing the Laser key If the error is still present the error message appears again after the Laser key is pressed Overloa
14. according to the section Connector pin out and switching on the DioPower it might happen that the temperature controller doesn t seem to control the temperature i e the measured temperature doesn t approach the desired temperature after some time or the laser diode is heated up instead of cooled down In this case the polarity of the thermoelectric cooler referred to the pin out as shown in the section Connectors pin out has to be changed Simply change the connection of the two leads of the thermoelectric cooler even if the occurring labelling Plus to Minus doesn t match obviously After this change the measured temperature should approach the desired temperature 29 5 4 Interlock The connector for the interlock 3 is located at the rear panel of the instrument 9 15 0000006 O oooooooo O 1 8 The connector at the rear panel is a D Sub 15 female The pin out is shown when facing the connector mounted to the rear panel directly Interlock IN 5V Interlock GND The interlock is realized with a loop as shown in the diagram below It shows the condition when the interlock loop is closed If the interlock feature is activated it is prior to the Laser key at the front panel Normally closed N contact opening contact at peripheral device If the interlock loop is opened while the interlock feature is activated the laser diode is immediately turned off and a error message appears on th
15. d error If a device module of the DioPower overloaded the laser diode and the thermoelectric coolers are turned off immediately One of the following messages appears on the display ERROR ERROR ERROR LASER DRIVER COOLER DRIVER 1 COOLER DRIVER 2 OVERLOAD OVERLOAD OVERLOAD 25 5 Connectors pin out As an option the instrument comes with the appropriate cables for the connectors used At one end the cable jacket is stripped off and the leads are separated Please connect the leads as shown in the following subsections Fix the leads to the appropriate connectors supplied with your laser diode If the instrument comes with a HeatSink provided by APhS only the wiring between the laser diode and the two coloured leads red and black at the HeatSink according the subsection laser diode has to be done If the instrument comes with a HeatSink and an already mounted laser diode provided by APhS remove the short circuit bridge at the connector of the cable for the laser diode and simply plug in the connectors for the laser diode and the HeatSink Attention 1 Double check if the wiring was done the right way A mismatch destroys the laser diode within microseconds in a unrecoverable way Laser diodes are extremely sensitive to electrostatic discharge Follow the instructions supplied with the laser diode very carefully The instrument must be turned off before making the connection to the output for the laser diode the therm
16. e display The laser diode can only be turned on again by either deactivating the interlock function or closing the interlock loop The DioPower comes with a Dummy connector D Sub 15 which provides the interlock loop When realizing the interlock loop with a peripheral device open the dummy connector remove the jumper from Pin1 to Pin2 and apply the cable coming from the peripheral device Instead of realizing a passive closed loop it is also possible to apply a TTL level signal to Pin1 referred to Pin2 Pin1 High U gt 2 4 V gt Interlock loop open Laser turned off Pint Low U 0 8 V gt Interlock loop closed Laser turned on Pin2 Reference Signal Ground 30 5 5 Serial interface The connector for the serial interface 2 is located at the rear panel of the instrument The instrument must be turned off before making the connection The connector at the rear panel is a D Sub 9 male The pin out is shown when facing the connector mounted to the rear panel directly 2 RXD receive 3 TXD send GND DULL The instrument comes with a suitable cable for connecting it to a free serial port of a computer Only use so called interconnecting serial cables with two male connectors where the leads for pin 2 and 3 are crossed on both ends A simple extension cable does not work 3 6 Interfaces command description The instrument can be remotely controlled with a PC All parameters can be set and read
17. efore using the DioPower with a laser diode make sure that the current limit is set to the specific value of the laser diode to be used see section Setting laser diode current limit The current applied to the laser diode must not exceed the maximum current specified by the manufacturer of the laser diode The emitted optical power of a laser diode also depends on the temperature Make sure that with the selected temperature of the laser diode and the emitted optical power is also within a specified range 4 3 1 Instrument switch on display MAIN menu The instrument is switched on with the Power switch 6 The green light emitting diode LED 7 indicates that all relevant components inside the instrument are supplied with power On the back lighted display the message Advanced Photonic Systems appears for a short time and the display changes to the following window the MAIN menu CW TLZNO sger2 0 0A 0 0A T 25 000 To na Every input which is followed by pressing the Enter key 2 is acknowledged by a short double beep The MAIN menu displays all relevant parameters CW PU Mode of laser diode CW constant current or PU pulsing current TL NO TL v v sec Laser diode turned on for specific time duration NO inactive v v sec indicates a value and the unit of the time duration lser Laser diode desired current 0 OA Laser diode actual current measured value Ti Cooler 1 actual temperature usually
18. eter value without a space 35 7 Specifications Laser Diode Driver 5 0 0 0 Long Term Stability 24hr 75 ppm Current Limit Range 0 50A Current Adjustment Accuracy 100 mA Repetition Rate 3dB 0 1 kHz Analog Modulation Transfer function 10A V Trigger 000 G TEC Controller PID Nt ee O TEC Output Cooler 1 Cooler 2 Peltier Current 0 10A 0 4 3A Peltier Voltage 0 15 V Max TEC Output Power 150 W 15W TEC Current Limit Range 0 10A 0 3A Ripple 100 mA 50 mA Temperature Sensors General Sensor Types Thermistor PT100 PT1000 C Thermistor Types NTC Thermistor Current 100 uA Thermistor Resistance 25 C 10 kQ ae ee Power Supply a a T R General Characteristics O IM Ambient Temperature operating 0 30 Relative Humidity operating 30 70 Weight 1 1 8kg Dimensions 450x140 x 500 W x H x D mm 36 Notes The risetime the falltime and the pulsewidth may be prolonged by long cables between the power supply and the laser diode The signal ground shielding of the BNC connectors of the trigger input the trigger output and the analogue modulation input BNC connector are isolated from the chassis ground earth Attention The output pin laser diode anode plus which is connected to the anode A of the laser diode is internally connected to any internal power supply voltage of t
19. g A signal voltage of 2 5 V refers to a laser diode current of 25A For maximum protection of the laser diode the current of the laser diode is limited to the selected current limit Therefore it might happen that the analogue modulated laser light is distorted due to the clipping of the maximum applied current to the laser diode In order not to distort the analogue modulated laser light pay attention not to exceed the valid analogue modulation signal level according to the transfer function for the current The laser diode should be turned on with the Laser key 4 prior to the external inputs The trigger signal is applied to the Trig In connector 9 at the front panel The valid range for the signal is according the specifications for TTL signals Low 0 V U 0 8V High 2 4 V U 5 V The bandwidth is DC to 1 kHz An applied TTL low signal leads to a turned off laser An applied TTL high signal leads to a turned on laser with a laser diode current as it is set within the MAIN menu see section Laser diode current E g If the laser diode current is set to 1 4 225A this current is applied to the laser diode when a TTL high signal is detected as external trigger signal The laser diode should be turned on with the Laser key 4 prior to the external inputs 13 The signal on the trigger output connector Trig Out 10 provides a synchronization between the internally generated pulses as specified by the pulse operational mode a
20. he instrument Please be aware that most of all medium and high power laser diodes have their housing electrically connected to the anode of the laser diode Therefore in order to avoid any grounding loops when applying external instruments to the DioPower unit it is recommended to isolate the housing of the laser diode from the chassis earth Remark If the laser diode is mounted to the heat spreader of the HeatSink provided by APhS it is already isolated from chassis ground earth 37
21. ith the rotary knob Confirm the selection with the Enter key SET CURR LIMIT COOLER 1 10 0A COOLER 2 3 0A Get back to the MAIN menu by pressing the Select key four times The desired cooler setting is stored permanently in a non volatile memory even when the instrument is switched off 22 4 5 Instrument settings The following instrument settings are stored permanently in a non volatile memory 4 5 1 Interlock The DioPower is equipped with an interlock feature which can be enabled or disabled The interlock is realized with a loop which has to be provided via the interlock connector see section Connector pin out By default the interlock feature is disabled If the interlock feature is enabled the interlock loop must be realized either with the provided dummy connector permanent closed loop or a peripheral device It is prior to the Laser key at the front panel The laser diode can only be turned on with pressing the Laser key at the front panel if the interlock loop is closed If the interlock loop is opened while the interlock feature is activated the laser diode is immediately turned off and a error message appears on the display The laser diode can only be turned on again by either deactivating the interlock feature or closing the interlock loop How to set the interlock feature Starting from the MAIN menu press the Select key to get to the SELECT menu SELECT LASER TIMING TEMPERATURE Press
22. n given in this document is subject to change without notice Copyright Advanced Photonic Systems APhS GmbH 2001 All rights reserved Reproduction adaptation or translation without prior written permission is prohibited except as allowed under the copyright laws 1 1 Warranty and Assistance This instrument manufactured by Advanced Photonic Systems is warranted against defects in material and workmanship for a period of 12 months from date of shipment to the customer During the warranty period Advanced Photonic Systems will at its option either repair or replace products which prove to be defective The warranty does not apply to defects resulting from improper use or maintenance by the buyer from unauthorized modifications or operation outside the environmental specifications and from electrostatic discharge ESD For warranty service or repair the instrument should be sent to Advanced Photonic Systems in appropriate packing Please enclose a detailed fault report including instrument type and serial number s 1 2 Maintenance The instrument does not require special maintenance if it is used correctly Servicing should only be performed by trained service personnel 1 3 General Safety Considerations Before switching on the instrument make sure it has been properly grounded through the supplied AC power cable to a socket outlet with a protective earth contact Any interruption of the grounding can result in personal injury
23. nd the external trigger The output is according to the specifications for TTL signals How to set the external analogue modulation and triggering Starting from the MAIN menu press the Select key 2 to get to the SELECT menu SELECT LASER TIMING TEMPERATURE SETTINGS Press the Up or Down key 2 to select the LASER sub menu Confirm the selection with the Enter key 2 SELECT LASER MODE EXTERNAL INPUTS Press the Up or Down key to select EXTERNAL INPUTS sub sub menu Confirm the selection with the Enter key SET EXT INPUTS EXT ANALOG DISABLE EXT TRIGGER DISABLE Press the Up or Down key to select the external input to be set Change the input setting between ENABLE and DISABLE with the Rotary knob Confirm the value with the Enter key Get back to the MAIN menu by pressing the Select key two times The desired external input mode is stored permanently in a non volatile memory even when the instrument is switched off 4 3 5 Laser diode current Attention Before using the DioPower with a laser diode make sure that the current limit is set to the specific value of the used laser diode see section Setting laser diode current limit The current applied to the laser diode must not exceed the maximum current given by the manufacturer of the laser diode The emitted optical power of a laser diode also depends on the temperature Make sure that with the selected temperature of the laser diode the emitted
24. ng from the MAIN menu press the Select key to get to the SELECT menu SELECT TEMPERATURE SETTINGS Press the Up or Down key to select the TIMING sub menu Confirm the selection with the Enter key SET TIMING PULSE PERIOD 10ms TIME LIMIT 0 15 Press the Up or Down key to select the parameter to be changed Change the value of the parameters with the rotary knob Confirm the value with the Enter key Get back to the MAIN menu by pressing the Select key two times Notes The two parameters pulse width and pulse period depend on each other The instrument will automatically force the other parameter within the valid range depending on the change of the selected parameter Values of the pulse width which are larger than the pulse period are not accepted by the instrument The pulse width must be within the range of 0 5 us to 490 ms The pulse period must be within the range of 1 us to 500 ms The time limit must be within the range of 0 1 s to 99 9 s 4 3 4 External analogue modulation and triggering of the laser diode The DioPower provides an external analogue modulation input an external triggering input and an external triggering output The analogue modulation signal is applied to the Analog In connector 8 at the front panel The valid range for the signal is 0 V to 5 V The transfer function for the applied signal voltage to the laser diode current is 10 A V The modulation bandwidth is DC to 1 KHz E
25. ng the Select key four times The desired cooler setting is stored permanently in a non volatile memory even when the instrument is switched off 21 4 4 4 3 Setting cooler current limit Cooler 1 is usually used for cooling the laser diode and delivered up to 10A 15V The cooler current limit can be set from 0 10A Cooler 2 is usually used for customized applications e g laser crystal cooling and delivered up to 3A 5V The cooler current limit can be set from 0 3A Always set the current limit to the maximum current value which can be found in the data sheet of the heat sink Setting the appropriate current limit protects the peltier elements from being overloaded electrically Note The set limit acts in both direction E g current limit 2 5A means a current range 2 5A 2 5A How to set the cooler current limit Starting from the MAIN menu press the Select key to get to the SELECT menu SELECT LASER TIMING TEMPERATURE Press the Up or Down key to select the COOLER SETTINGS sub menu Confirm the selection with the Enter key SELECT SETTINGS LASER CURRENT LIMIT TEMPERATURE SETTINGS COOLER SETTINGS INTERLOCK SETTINGS Press the Up or Down key to select the COOLER CURRENT LIMIT sub sub menu Confirm the selection with the Enter key COOLER SETTINGS SELECT COOLER SELECT SENSOR COOLER CURRENT LIMIT Press the Up or Down key to select the cooler Change the value of the parameter w
26. oelectric controller and the temperature sensor Advanced Photonic Systems is not responsible for any damage arising from a mismatch in wiring Attention 2 The output pin laser diode anode plus which is connected to the anode A of the laser diode is internally connected to any internal power supply voltage of the instrument Please be aware that most of all medium and high power laser diodes have their housing electrically connected to the anode of the laser diode Therefore in order to avoid any grounding loops when applying external instruments to the DioPower unit it is recommended to isolate the housing of the laser diode from the chassis earth Remark If the laser diode is mounted to the heat spreader of the HeatSink provided by APhS it is already isolated from chassis ground earth 26 5 1 Laser diode The instrument must be turned off before making the connection The connector for the laser diode 5 is located at the rear panel of the instrument and it is a male type The pin out is shown when facing the connector male mounted to the rear panel directly Designation Colour cable lead 1 5 6 Laser diode anode plus red Laser diode cathode minus black not connected n c For best performance some pins have the same designation 27 5 2 Thermoelectric cooler 1 The instrument must be turned off before making the connection The connector for the cooler 1 the
27. otary knob Confirm the selection with the Enter key SELECT COOLER COOLER 1 ENABLE COOLER 2 DISABLE Get back to the MAIN menu by pressing the Select key four times The desired cooler setting is stored permanently in a non volatile memory even when the instrument is switched off 20 4 4 4 2 Select sensor The DioPower can work with three several temperature sensor types NTC PT100 PT1000 Attention Before changing the sensor type make sure that the appropriate cooler controller is disabled see section select cooler the correct sensor type is connected on the correct connector see section Connectors pin out How to select the sensor type Starting from the MAIN menu press the Select key to get to the SELECT menu SELECT LASER TIMING TEMPERATURE Press the Up or Down key to select the COOLER SETTINGS sub menu Confirm the selection with the Enter key SELECT SETTINGS LASER CURRENT LIMIT TEMPERATURE SETTINGS COOLER SETTINGS INTERLOCK SETTINGS Press the Up or Down key to select the SELECT SENSOR sub sub menu Confirm the selection with the Enter key COOLER SETTINGS SELECT COOLER COOLER CURRENT LIMIT Press the Up or Down key to select the cooler whose sensor is to be changed Change the setting between NTC PT100 and PT1000 with the Rotary knob Confirm the selection with the Enter key SELECT SENSOR COOLER 1 NTC 1 COOLER 2 PT100 2 Get back to the MAIN menu by pressi
28. out with a choice of commands including turning on and turning off of the laser diode 6 1 Serial interface Please make the appropriate connection with the provided cable from a free serial port of the PC to the serial interface connector of the DioPower Then switch on the DioPower Any program which provides the transfer of commands via a serial communication port of a PC can be used A simple terminal program coming with WINDOWS 9x is HYPER TERMINAL Select the correct port e g COM 1 Set the serial port parameters as follows Baud rate 9 600 Data bits 8 Stop bits 1 Parity none Description of the format of the transfer protocol First there are two keywords which represents the action of writing or reading of information to and from the DioPower Write keyword set e Read keyword get These keywords are followed by a command separated by a space Some commands require the additional input of a parameter and maybe also a unit e Writing a command set ccc Enter e g Turning on or turning off the laser diode depending on the condition before the command was sent out toggle function set LAS Enter e Writing a command with a parameter Set ccc vv v lt Enter gt e g Setting the current of the laser diode to 1 25 A set SLC 1 25 Enter e g Setting the pulse width to 100 milliseconds set PUW 100ms Enter e Reading a value or condition get ccc lt Enter gt e g Reading the ac
29. r enable parameter 0 DISABLE ENABLE E g set AIE 1 enabled the analog input Sensor type set CS1 v The value for setting sensor type Value v uam PT100 PT1000 E g set CS1 0 sets cooler sensor 1 of NTC 34 e Sensor NTC B value e g set BV1 3900 or get BV1 The B value should be set to the given value in the NTC data sheet Values in the range from 2000 up to 10000 are allowed The default value is 3450 e Error status get ERR Following associations of values which will be returned are valid Temperature sensor 2 not detected Temperature sensor 1 shorted Temperature 1 out of range Laser driver overload o 4 6 8 9 md o Note If an error occurs the error status keep its value until the device receive the error reset command set ERR 0 Notation for the format of the transfer protocol The keywords and the commands can be written either in lower case or upper case We used lower cases for the keywords and upper cases for the commands right here The keywords the commands and the parameters must be separated by a space The command ccc consists of a three digit word The parameter ppp consists of a one to three digit value with or without a separation dot The following variations are possible p pp ppp p p pp p The use of units is only required for the input of the pulse width the pulse period and the time limit The unit must follow the param
30. ric cooler and the temperature sensor respectively the HeatSink and providing the appropriate connections including installation of the Dummy interlock connector to the instrument the DioPower is ready to be switched on Please read the whole operating instructions before using this instrument together with a laser diode 4 1 Elements of the instrument at the front panel Photome DioPower move 9NO I LASER DOWN ENTER 1 2 3 4 5 6 7 8 9 1 Display Keys for setting instrument Up Down Select Enter Rotary knob for setting laser diode current and various settings within the menus Key for turning on laser diode Laser diode on indicator yellow Power switch mains Power on indicator green Connector for input of analogue modulation signal Connector for input of trigger signal 0 Connector for output of trigger signal 4 2 Elements of the instrument at the rear panel 5 Line L o Laser Cooler a Ww N o 4 b Interlock oj P jJ X m rA Sensors oa fF WO DN Connector for AC line including mains fuses Connector for Serial Interface RS232 Connector for Interlock Connector for Temperature Sensors and Cooler 2 optional Connector for laser diode Connector for Cooler 1 Heat Sink thermoelectric cooler 1 temperature sensor 1 fan 10 4 3 Laser diode controller Attention B
31. tched on The laser diode output is short circuited by a relay when the instrument is switched off The laser diode current is slowly ramped up and ramped down softstart 4 3 6 Setting laser diode current limit Always set the current limit to the indicated maximum current value of the laser diode which can be found in the individual data sheet Setting the appropriate current limit protects the laser diode from being overloaded electrically and optically Starting from the MAIN menu press the Select key to get to the SELECT menu SELECT LASER TIMING TEMPERATURE Press the Up or Down key to select the SETTINGS sub menu Confirm the selection with the Enter key SELECT SETTINGS LASER CURRENT LIMIT TEMPERATURE SETTINGS COOLER SETTINGS INTERLOCK SETTINGS 15 Press the Up or Down key to select LASER CURRENT LIMIT sub sub menu Confirm the selection with the Enter key SET CURR LIMIT CURRENT LIMIT 50 0A Should be set to the given value in the LD data sheet Change the value of the laser diode current limit with the rotary knob Confirm the value with the Enter key Get back to the MAIN menu by pressing the Select key three times The value of the current limit is stored permanently in a non volatile memory even when the instrument is switched off Remark The maximum possible current limit is predefined by the instrument 16 4 4 Thermoelectric cooler controller The DioPower contains one or
32. temperature sensor 1 type NTC and the fan as of the HeatSink 6 is located at the rear panel of the instrument and it is a female type The pin out is shown when facing the connector mounted to the rear panel directly Pin number Designation Thermoelectric cooler 1 Peltier minus Thermoelectric cooler 1 Peltier plus Temperature sensor 1 type NTC Temperature sensor 1 type NTC Fan plus Fan minus Center Pin Earth The green yellow lead earth is connected to the base plate of the heatsink do not connect it to the laser diode housing or to the heatspreader on which the laser diode is directly mounted 28 5 3 Thermoelectric cooler 2 The instrument must be turned off before making the connection The connector for the cooler 2 and for the temperature sensors 4 is located at the rear panel of the instrument and it is a 25 pol SUB D female type 14 25 ooo0oo0oo0o0000000 0 oooo0oo0oo00000000 0 1 13 25pol Sub D female Function 1 NTC 1A 3 PT100 1A Cooler 1 Sensor pin A 5 PT1000 1A 14 NTC 1B 16 PT100 1B Cooler 1 Sensor pin B 18 PT1000 1B 2 NTC 2A Cooler 2 Sensor pin A 4 PT100 2A 6 PT1000 2A 15 NTC 2B Cooler 2 Sensor pin B 17 PT100 2B 19 PT1000 2B 10 Cooler 2 Peltier 23 12 25 Cooler 2 Peltier Trouble shooting After preparing the connection of the thermoelectric cooler and the temperature sensor
33. tents Control Unit DioPower Cable for serial interface RS232 D Sub 9 for interconnecting instrument with PC DP Cable RS232 Dummy connector D Sub 15 for interlock loop DP Con Interlock AC Power Cable Manual Optional Cable for connecting the laser diode DP Cable LD Cable for connecting the thermoelectric cooler temperature sensor and fan DP Cable TEC TS Air cooled HeatSink including cables for connecting the laser diode thermoelectric cooler temperature sensor and fan Short circuit bridge for the connector at the cable for the laser diode Laser diode mounted on air cooled HeatSink 2 Introduction The instruments of the DioPower series are compact control units for driving medium power and high power laser diodes The DioPower delivers depending on the version a current up to 50 A at a voltage of maximum 6 V The DioPower is designed for cw and pulsed operation With pulsed operation various settings of duty cycle pulse duration and number of pulse events are possible The DioPower also features external inputs for analogue modulation of the laser diode and external triggering of the laser diode Besides controlling the current of the laser diodes the DioPower also features one or two optional built in controllers for thermoelectric coolers Peltier elements With an optional air cooled heatsink please contact Advanced Photonic Systems the laser diode can easily be kept at constant temperature The
34. the Up or Down key to select the SETTINGS sub menu Confirm the selection with the Enter key SELECT SETTINGS LASER CURRENT LIMIT TEMPERATURE SETTINGS COOLER SETTINGS INTERLOCK SETTINGS Press the Up or Down key to select the INTERLOCK SETTINGS sub sub menu Confirm the selection with the Enter key SET INTERLOCK INTERLOCK ENABLE Change the interlock setting between ENABLE and DISABLE with the Rotary knob Confirm the selection with the Enter key Get back to the MAIN menu by pressing the Select key four times 23 4 6 Error Messages Interlock error If the interlock feature is activated as described in the section Instrument settings and the interlock loop is opened the laser is turned off immediately and the following message appears on the display ERROR INTERLOCK OPEN In order to return to the MAIN menu the error massage must be confirmed by pressing the Enter key After the interlock loop is closed again the laser diode can be turned on again by pressing the Laser key If the interlock loop is still opened the error message appears again after the Laser key is pressed Temperature sensor error If an temperature sensor circuit is shortened or opened the laser diode and the thermoelectric coolers are turned off immediately One of the following messages appears on the display ERROR ERROR TEMPERATURE SENSOR 1 TEMPERATURE SENSOR 1 NOT DETECTED SHORTED ERROR ERROR TEMPERATURE SENSOR 2
35. tion Connector pin out and switching on the DioPower it might happen that the temperature controller doesn t seem to control the temperature i e the measured temperature doesn t approach the desired temperature after some time or the laser diode is heated up instead of cooled down In this case the polarity of the thermoelectric cooler referred to the pin out as shown in the section Connectors pin out has to be changed Simply change the connection of the two leads of the thermoelectric cooler even if the occurring labelling Plus to Minus doesn t match obviously After this change the measured temperature should approach the desired temperature 4 4 1 Temperature setting Starting from the MAIN menu press the Select key to get to the SELECT menu SELECT LASER SETTINGS Press the Up or Down key to select the TEMPERATURE sub menu Confirm the selection with the Enter key 17 SET TEMPERATURE TEMPERATURE 1 25 0C TEMPERATURE 2 30 0 C Press the Up or Down key to select TEMPERATURE 1 or TEMPERATURE 2 Change the value of the temperature with the rotary knob Confirm the value with the Enter key Get back to the MAIN menu by pressing the Select key two times Note The value of the temperature can only be changed within the valid temperature range as defined by the upper and lower temperature limit see section Setting temperature limits The value for the temperature must be within 0C to 50 CC
36. tual temperature of the laser diode channel 1 get at Enter In response the DioPower sends out to the PC for example the value 25 3 the unit is C The DioPower accepts only parameter values which are within the predefined range or within the limits which have been set 32 Note The word Enter represents the ENTER key on the PC keyboard Remark Some terminal programs send out the corresponding code right after the key was hit Therefore a wrong input must be finished with hitting the ENTER key on the PC and the input must be repeated Command Abbreviation Parameter Read Key in required only unit required xp pH x i Laser On Off LAS Laser operating mode LMO Pulse width 0 5ms PUW 490 ms PUW Pulse period 1 ms PUP 500 ms Time limit 0 1 s TIL 99 9 s Analog input enable Trigger input enable Actual temperature cooler 1 control loop parameter cooler 1 D control loop parameter cooler 1 Actual temperature cooler 2 Set temperature cooler 2 Upper temperature limit cooler 2 Lower temperature limit cooler 2 P control loop parameter cooler 2 control loop parameter cooler 2 D control loop parameter cooler 2 Cooler 1 enable Cooler 1 sensor Cooler 1 sensor NTC B value Cooler 1 current limit Cooler 2 enable Cooler 2 sensor Cooler 2 sensor NTC B value Interlock enable ILE Error status ERR a v m NIN r UJ lt N O t
37. ture limits are stored permanently in a non volatile memory even when the instrument is switched off Note The instrument accepts only inputs where the temperature of the upper limit is higher than the temperature of the lower limit The value for the upper and lower temperature limit must be within 0 C to 50 C 4 4 3 Setting temperature control loop parameters The temperature controller is realized as a PID control loop for optimum performance P means proportional means integral and D means differential portion The control loop parameters can be set to values between 0 and 100 and are stored permanently in a non volatile memory The default settings which provide usually good controlling are as follows 70 3 If the control loop is not stable after some minutes of active operating e g the temperature is oscillating between two values which differ about 0 5 the P portion should be decreased If the measured temperature does not become equal to the desired temperature the I portion should be increased How to set the temperature control loop parameters Please follow the instructions as described in section Setting temperature limits and select the parameter to be changed Remark In general a larger P portion or a smaller l portion speeds up the settling time of the control loop but with the first the controller might oscillate and with the latter there might be a permanent difference between the
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