Oscillator check | Quantum Instruments Cascade Laser Starter Kit

Starter Kit Instruction Manual

Maintenance

Oscillator check

[15]Measure the frequency on the pin 7 of U13 (1).

Note: The value is 28KHz + /- 3KHz

49

1

Fig.42: TCU151 main board

Current/Voltage ratio adjustment

[16]Adjust the trimmer P4 (6) in order to read B4 = 0.6V (4).

[17] Set the selector (5) to mode Setting +I.

The LCD screen should display 1.00 A.

Note: If it is not the case, adjust it with P2

(2).

[18]Adjust the trimmer P4 in order to read

B4 = 3.0 V.

The LCD screen should display 5.00 A.

Note: If it is not the case, adjust it with P2

(2). Example : 0,6 V ⇒ 0,99 A and 3V ⇒

4,99 A.

[19]Set the switch on the front panel to mode

Setting -I.

[20]Repeat steps [2] and [4] for P5 (7) and

B5 (3).

2

3

4

Fig.43: TCU151 main board

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Fig.44: TC51 front panel

Image 50

Quantum Instruments Cascade Laser Starter Kit manual Oscillator check, Current/Voltage ratio adjustment, Setting

Contents

Quantum Cascade Laser Starter Kit Instructions Manual Web version Contents Maintenance Overview InstallationTroubleshooting Use Appendix Limited waranty IdentiﬁcationDocument Manufacturer Generalities GeneralChapter overview Compliance Product GlossaryPersons Personnel Typographic conventions Commands styleProcedure style Description style See page x-y Troubleshooting style ProblemProcedure eﬀects style Possible causePage Non-compliance with the safety regulations Safety InstructionsImportance of safety instructions Introduction Compliance and informa- tion General safety instructionsEnvironmental conditions Description System Composition Description DFB and FP Quantum Cascade LasersIf no conﬁguration is speciﬁed, the DN pad is used Geometry of QC lasers Speciﬁcations Electrical model characteristics Electrical model Laboratory Laser HousingLLH100 LLH100 external view description Laboratory Laser Housing internal view LLH100 internal view Speciﬁcations of the Peltier connector Thermo-Electric Cooler TEC and PT100 connections Speciﬁcations of the measurement connector Measurement connection QCL pulser switching unitLDD100 QCL pulser switching unit front and rear view Measured voltages QCL pulse switching measuring unitGeneralities Timing data Laser peak current Duty cycle calculation Accuracy considerations Laser peak voltageAverage dissipation Trigger and logic output signals Ω TTL driver circuit QCL pulser timing unit TPG128 QCL temperature controllerTCU151 Peltier and PT100 connections General InstallationChapter overview Packing list Standard items 110-120V, 60Hz USA 220-240V, 50Hz Europe Setting the appropriate AC voltage on TCU151Procedure Installing the starter Kit Before beginning Connecting Starter Kit Use QCL pulse timing unit com- mand description TCU151 command description TCU151 temperature controler front panel Proceedings Laser utilisationOverview Starting the TPG128 Procedure Interlock utilisation Interlock utilisation DC power supply is not ﬂoating TroubleshootingPower supply reaches max cur- rent for a very low voltage Principle QCL 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 laser Overview MaintenanceHow to remove the covers of TCU151 and TPG128 Replacement procedures Quantum Cascade Laser replace Ment Facet on the case, it is extremely fragile + LLH100 connection QCL UP and DN position Exchange Exchanging the laser If the ambient atmosphere is humid this is Humidity Before beggining interlock set Ting TCU151 temperature con Troller interlock settingProcedure interlock setting Needed material 1 TPG128 calibration Calibaration proceduresProcedure calibration Generalities TPG128 main board TPG128 main board 2 TCU151 temperature controller calibration Procedure +5V/-5V power supply check Sensing level and range adjustement = 1.22 to Temperature Reference oﬀset adjustment Oscillator check Current/Voltage ratio adjustmentSetting LCD screen should display 1.00 a 7V = 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 oﬀ Direct absorption Application notesDetection techniques Frequency modulation technique Tildas Photoacoustic detection Photoacoustic technique General 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 input Unpacking NS laser from its transportation box Unpacking instructions for NS submounts