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Quantum Instruments Cascade Laser Starter Kit manual Starting the TPG128

Models: Cascade Laser Starter Kit

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Starter Kit Instruction Manual

Use

[5]Turn the TPG128 ON (8) and set the pulse period to 2.0 and the range to 0.5 to 10.5 µs (medium), corresponding to a period length of about 2.5us, or to the values speciﬁed on the datasheet or by Alpes Lasers.

[6]Set the pulse duration (11) to 3.0, corre- sponding to a pulse length of about 50ns, or to the values speciﬁed on the datasheet or by Alpes Lasers.

[7]Verify laser cabling, power meter range set corresponding to the power range of the laser (speciﬁed in the datasheet), zeroed and aligned.

[8]Turn the HV power supply ON, then the TPG128 ON, and slowly increase the HV out- put voltage (but not higher than speciﬁed in the datasheet of the laser!)

[9]If available, monitor the averaged output to avoid overloading the laser. In any case place one probe on both the anode and the cathode of the laser and view it with an oscil- loscope.

[10]Subtract the two traces and you get the voltage across the laser that should not be more than the speciﬁed max voltage.

Note: The laboratory housing LLH100 makes available two outputs giving access to these voltages (see documentation).

[11]Set the desired pulse and period length as speciﬁed in the datasheet or by special agree- ment with Alpes Lasers.

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Fig.23: Starting the TPG128

Image 34

Quantum Instruments Cascade Laser Starter Kit manual Starting the TPG128

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 IntroductionEnvironmental conditions General safety instructionsCompliance and informa- tion 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 calculationAverage dissipation Laser peak voltageAccuracy considerations 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 itemsProcedure Setting the appropriate AC voltage on TCU151110-120V, 60Hz USA 220-240V, 50Hz Europe Installing the starter Kit Before beginningConnecting Starter Kit Use QCL pulse timing unit com- mand descriptionTCU151 command description TCU151 temperature controler front panelOverview Laser utilisationProceedings 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 laserHow to remove the covers of TCU151 and TPG128 MaintenanceOverview 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 ≤ 1A Current adjustment→ Value displayed should tend to the deﬁned value 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 techniqueBias Circut Bias-T AppendixGeneral 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