Quantum Instruments Cascade Laser Starter Kit manual QCL UP and DN position Exchange

Page 41

Starter Kit Instruction Manual

Maintenance

40

8.2.2 QCL ”UP” and ”DN” position

 

 

exchange

 

 

 

Before beginning

 

 

 

[1] Switch the QCL Starter Kit OFF.

 

1

 

 

 

 

Material needed

 

 

 

• 1 set of Allen keys.

 

 

 

• 1 ohmmeter.

 

 

 

• 1 FP-QCL laser contact plate.

 

 

 

• 1 pair of tweezers.

 

2

 

 

 

 

Procedure

 

 

 

To exchange the beam of a Quantum Cascade Laser,

 

 

proceed as follows:

 

3

 

 

 

 

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

4

 

Laser Housing (LLH100) by unscrewing the

 

screws (1).

 

 

 

[2] Remove the PET U-shaped holder (4) by

 

 

unscrewing the fixing screws (3).

 

 

 

Caution ! Pay attention NOT to drop the

 

 

laser!

 

 

 

[3] Remove the gilded copper contact (6) by

 

 

unscrewing the back screw (5).

 

 

 

[4] Install the opposite gilded copper contact Fig.28: Removing the laser recptacle

(6) by screwing back the screw (5).

5

6

Fig.29: Exchanging the laser

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Contents Instructions Manual Web version Quantum Cascade Laser Starter KitContents Troubleshooting InstallationMaintenance Overview UseAppendix Document IdentificationLimited waranty ManufacturerChapter overview GeneralGeneralities CompliancePersons GlossaryProduct PersonnelProcedure style Commands styleTypographic conventions Description styleProcedure effects style ProblemSee page x-y Troubleshooting style Possible causePage Importance of safety instructions Safety InstructionsNon-compliance with the safety regulations IntroductionCompliance and informa- tion General safety instructionsEnvironmental conditions System Composition DescriptionIf no configuration is specified, the DN pad is used DFB and FP Quantum Cascade LasersDescription Geometry of QC lasersSpecifications 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 unitLDD100Generalities QCL pulse switching measuring unitMeasured voltages Timing dataDuty cycle calculation Laser peak currentAccuracy considerations Laser peak voltageAverage dissipation QCL pulser timing unit TPG128 Trigger and logic output signals Ω TTL driver circuitPeltier and PT100 connections QCL temperature controllerTCU151Chapter overview Packing list InstallationGeneral Standard items110-120V, 60Hz USA 220-240V, 50Hz Europe Setting the appropriate AC voltage on TCU151Procedure Before beginning Installing the starter KitConnecting Starter Kit QCL pulse timing unit com- mand description UseTCU151 temperature controler front panel TCU151 command descriptionProceedings Laser utilisationOverview Starting the TPG128 Interlock utilisation Procedure Interlock utilisationPower supply reaches max cur- rent for a very low voltage TroubleshootingDC power supply is not floating PrincipleLaser does not draw current Laser draws current but gives no lightQCL laser is not used with the LLH and is grounded There is no contact with the laserOverview MaintenanceHow to remove the covers of TCU151 and TPG128 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 isProcedure interlock setting TCU151 temperature con Troller interlock settingBefore beggining interlock set Ting Needed materialProcedure calibration Calibaration procedures1 TPG128 calibration GeneralitiesTPG128 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 Setting Current/Voltage ratio adjustmentOscillator check LCD screen should display 1.00 aStarting the power section of the instru Ment 7V = 70 C If needed, adjust it with the trimmer P92→ Value displayed should tend to the defined value Current adjustment→ Value displayed ≤ 1A → The temperature displayed 2 should be 035 C Miscellaneous functions testing Temperature Limit testingThreshold on → The red LED 1 should turn offDetection techniques Application notesDirect absorption Frequency modulation technique TildasPhotoacoustic technique Photoacoustic detectionGeneral AppendixBias Circut Bias-T 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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