Quantum Instruments Cascade Laser Starter Kit manual Maintenance, Overview

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Chapter 8

Maintenance

8.1Overview

This chapter describes all procedures of mainte- nance and calibration for the QCL starter Kit. The procedures described herein must be performed by personnel trained on the electronic ﬁeld, with ac- ceptance by Alpes Lasers, otherwise the warranty will be lost.

Note: The TTL Pulse Generator (TPG128) and the Temperature Controller (TCU151) are calibrated in factory.

8.1.1How to remove the covers of TCU151 and TPG128

Pull oﬀ the light gray plastic pieces of the side of the front and back plates. Lift oﬀ the light gray plastic shades form the side of the box, which gives access to the screws holding the top and bottom covers.

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Contents Quantum Cascade Laser Starter Kit Instructions Manual Web versionContents Maintenance Overview InstallationTroubleshooting UseAppendix Limited waranty IdentiﬁcationDocument ManufacturerGeneralities GeneralChapter overview ComplianceProduct GlossaryPersons PersonnelTypographic conventions Commands styleProcedure style Description styleSee page x-y Troubleshooting style ProblemProcedure eﬀects style Possible causePage Non-compliance with the safety regulations Safety InstructionsImportance of safety instructions IntroductionCompliance and informa- tion General safety instructionsEnvironmental conditions Description System CompositionDescription DFB and FP Quantum Cascade LasersIf no conﬁguration is speciﬁed, the DN pad is used Geometry of QC lasersSpeciﬁcations Electrical model characteristics Electrical modelLaboratory Laser HousingLLH100 LLH100 external view descriptionLaboratory Laser Housing internal view LLH100 internal viewSpeciﬁcations of the Peltier connector Thermo-Electric Cooler TEC and PT100 connectionsSpeciﬁcations of the measurement connector Measurement connectionQCL pulser switching unitLDD100 QCL pulser switching unit front and rear viewMeasured voltages QCL pulse switching measuring unitGeneralities Timing dataLaser peak current Duty cycle calculationAccuracy considerations Laser peak voltageAverage dissipation Trigger and logic output signals Ω TTL driver circuit QCL pulser timing unit TPG128QCL temperature controllerTCU151 Peltier and PT100 connectionsGeneral InstallationChapter overview Packing list Standard items110-120V, 60Hz USA 220-240V, 50Hz Europe Setting the appropriate AC voltage on TCU151Procedure Installing the starter Kit Before beginningConnecting Starter Kit Use QCL pulse timing unit com- mand descriptionTCU151 command description TCU151 temperature controler front panelProceedings Laser utilisationOverview Starting the TPG128 Procedure Interlock utilisation Interlock utilisationDC power supply is not ﬂoating TroubleshootingPower supply reaches max cur- rent for a very low voltage PrincipleQCL laser is not used with the LLH and is grounded Laser draws current but gives no lightLaser does not draw current There is no contact with the laserOverview MaintenanceHow to remove the covers of TCU151 and TPG128 Replacement procedures Quantum Cascade Laser replace MentFacet on the case, it is extremely fragile + LLH100 connectionQCL UP and DN position Exchange Exchanging the laserIf the ambient atmosphere is humid this is HumidityBefore beggining interlock set Ting TCU151 temperature con Troller interlock settingProcedure interlock setting Needed material1 TPG128 calibration Calibaration proceduresProcedure calibration GeneralitiesTPG128 main board TPG128 main board 2 TCU151 temperature controller calibration Procedure +5V/-5V power supply checkSensing level and range adjustement = 1.22 toTemperature Reference oﬀset adjustment Oscillator check Current/Voltage ratio adjustmentSetting LCD screen should display 1.00 a7V = 70 C If needed, adjust it with the trimmer P92 Starting the power section of the instru Ment→ Value displayed should tend to the deﬁned value Current adjustment→ Value displayed ≤ 1A Threshold on Miscellaneous functions testing Temperature Limit testing→ The temperature displayed 2 should be 035 C → The red LED 1 should turn oﬀDirect absorption Application notesDetection techniques Frequency modulation technique TildasPhotoacoustic detection Photoacoustic techniqueGeneral AppendixBias Circut Bias-T Utilisation What has to be kept in mind before use? Current and voltage ranges of the Bias-T cir- cuit Avoid reverse polarity on the inputUnpacking NS laser from its transportation box Unpacking instructions for NS submounts