Quantum Instruments Cascade Laser Starter Kit manual

Starter Kit Instruction Manual

Description

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4.4.4Measurement connection

These connections give access to the voltage on the laser.

The ”L” connection is connected AC coupled to the cathode of the laser through a divider by ten. The end of cable must be 50Ω terminated for accu- rate measurement. The ”B” is connected the same to the anode of the laser (Base Receptacle).

By using the math trace of an oscilloscope show- ing the ”L” channel minus the ”B”, one can get the voltage on the laser.

This measurement is more accurate than the in- formation obtained from the LDD100 measurement unit.

For more details, refer to LDD100 Diagram Block on page ??.

Speciﬁcations of the measurement connector

Vacuum case plug reference: . . . . . . . LEMO #

HGP.00.250.CTLPV

Cable plug reference: . . . . . . . . . . . . . . LEMO #

FFS.00.250.CTCE31

Cable : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RG174

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Quantum Instruments Cascade Laser Starter Kit manual Measurement connection, Speciﬁcations of the measurement connector

Contents

Quantum Cascade Laser Starter Kit Instructions Manual Web version Contents Installation TroubleshootingMaintenance Overview Use Appendix Identiﬁcation DocumentLimited waranty Manufacturer General Chapter overviewGeneralities Compliance Glossary PersonsProduct Personnel Commands style Procedure styleTypographic conventions Description style Problem Procedure eﬀects styleSee page x-y Troubleshooting style Possible causePage Safety Instructions Importance of safety instructionsNon-compliance with the safety regulations Introduction Compliance and informa- tion General safety instructionsEnvironmental conditions Description System Composition DFB and FP Quantum Cascade Lasers If no conﬁguration is speciﬁed, the DN pad is usedDescription 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 QCL pulse switching measuring unit GeneralitiesMeasured voltages 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 Installation Chapter overview Packing listGeneral 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 Troubleshooting Power supply reaches max cur- rent for a very low voltageDC power supply is not ﬂoating Principle Laser draws current but gives no light Laser does not draw currentQCL laser is not used with the LLH and is grounded 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 TCU151 temperature con Troller interlock setting Procedure interlock settingBefore beggining interlock set Ting Needed material Calibaration procedures Procedure calibration1 TPG128 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 Current/Voltage ratio adjustment SettingOscillator check 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 Miscellaneous functions testing Temperature Limit testing → The temperature displayed 2 should be 035 CThreshold on → The red LED 1 should turn oﬀ Application notes Detection techniquesDirect absorption 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