Quantum Instruments Cascade Laser Starter Kit manual Replacement procedures

Page 39

Starter Kit Instruction Manual

Maintenance

38

8.2

Replacement procedures

 

 

 

8.2.1 Quantum Cascade Laser replace-

 

 

 

ment

 

 

 

Before beginning

 

 

 

 

[1] Switch the QCL Starter Kit OFF

 

1

 

Material needed

 

 

 

• 1 set of Allen keys.

 

 

 

• 1 ohmmeter.

 

 

 

• 1 QCL laser.

 

 

5

• a pair of tweezers.

 

2

 

 

Procedure

 

 

 

To replace the Quantum Cascade Laser, proceed as

3

 

follows:

 

 

 

 

 

 

[1] Remove the top cover (2) of the Laboratory

 

 

 

Laser Housing (LLH100) by unscrewing the

 

 

 

screws (1)

 

4

 

 

[2] Remove the PET U-shaped holder (5) by

 

 

 

unscrewing the fixing screws (3)

 

 

 

 

CAUTION ! Pay attention NOT to drop the

 

 

 

laser!

 

 

 

 

[3] Remove the laser (4). Hold the laser on

 

 

 

the gilded ceramic pads with the tweezers pins

 

 

 

along the axis of the largest length of the cop-

Fig.26: Removing the laser

 

 

per submount

 

 

 

!WARNING ! Take especially care not to touch the active region of the laser or the wire bonds!

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Contents Instructions Manual Web version Quantum Cascade Laser Starter KitContents Use InstallationTroubleshooting Maintenance OverviewAppendix Manufacturer IdentificationDocument Limited warantyCompliance GeneralChapter overview GeneralitiesPersonnel GlossaryPersons ProductDescription style Commands styleProcedure style Typographic conventionsPossible cause ProblemProcedure effects style See page x-y Troubleshooting stylePage Introduction Safety InstructionsImportance of safety instructions Non-compliance with the safety regulationsGeneral safety instructions Environmental conditionsCompliance and informa- tion System Composition DescriptionGeometry of QC lasers DFB and FP Quantum Cascade LasersIf no configuration is specified, the DN pad is used DescriptionSpecifications Electrical model Electrical model characteristicsLLH100 external view description Laboratory Laser HousingLLH100LLH100 internal view Laboratory Laser Housing internal viewThermo-Electric Cooler TEC and PT100 connections Specifications of the Peltier connectorMeasurement connection Specifications of the measurement connectorQCL pulser switching unit front and rear view QCL pulser switching unitLDD100Timing data QCL pulse switching measuring unitGeneralities Measured voltagesDuty cycle calculation Laser peak currentLaser peak voltage Average dissipationAccuracy considerations QCL pulser timing unit TPG128 Trigger and logic output signals Ω TTL driver circuitPeltier and PT100 connections QCL temperature controllerTCU151Standard items InstallationChapter overview Packing list GeneralSetting the appropriate AC voltage on TCU151 Procedure110-120V, 60Hz USA 220-240V, 50Hz Europe Before beginning Installing the starter KitConnecting Starter Kit QCL pulse timing unit com- mand description UseTCU151 temperature controler front panel TCU151 command descriptionLaser utilisation OverviewProceedings Starting the TPG128 Interlock utilisation Procedure Interlock utilisationPrinciple TroubleshootingPower supply reaches max cur- rent for a very low voltage DC power supply is not floatingThere is no contact with the laser Laser draws current but gives no lightLaser does not draw current QCL laser is not used with the LLH and is groundedMaintenance How to remove the covers of TCU151 and TPG128Overview Quantum Cascade Laser replace Ment Replacement procedures+ LLH100 connection Facet on the case, it is extremely fragileExchanging the laser QCL UP and DN position ExchangeHumidity If the ambient atmosphere is humid this isNeeded material TCU151 temperature con Troller interlock settingProcedure interlock setting Before beggining interlock set TingGeneralities Calibaration proceduresProcedure calibration 1 TPG128 calibrationTPG128 main board TPG128 main board Procedure +5V/-5V power supply check 2 TCU151 temperature controller calibration= 1.22 to Sensing level and range adjustementTemperature Reference offset adjustment LCD screen should display 1.00 a Current/Voltage ratio adjustmentSetting Oscillator checkStarting the power section of the instru Ment 7V = 70 C If needed, adjust it with the trimmer P92Current adjustment → Value displayed ≤ 1A→ Value displayed should tend to the defined value → The red LED 1 should turn off Miscellaneous functions testing Temperature Limit testing→ The temperature displayed 2 should be 035 C Threshold onFrequency modulation technique Tildas Application notesDetection techniques Direct absorptionPhotoacoustic technique Photoacoustic detectionAppendix Bias Circut Bias-TGeneral Utilisation What has to be kept in mind before use? Avoid reverse polarity on the input Current and voltage ranges of the Bias-T cir- cuitUnpacking instructions for NS submounts Unpacking NS laser from its transportation box
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