Quantum Instruments Cascade Laser Starter Kit manual Laser utilisation, Overview, Proceedings

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Starter Kit Instruction Manual

Use

6.4Laser utilisation

6.4.1Overview

In order to insure a correct use and and an appropri- ate lifetime to the laser, it is recommended to pro- ceed according a speciﬁc order as below:

•Start water ﬂow to cool the LLH100.

•Turn on the temperature controller and set the desired temperature.

•Start the pulse generator.

•Switch on the power supply.

6.4.2Proceedings

To use the Quantum Cascade Laser, proceed as fol- lows:

[1]Make sure that the laser has been installed properly (see page 38.

[2]If available, turn on the water on the LLH100 module.

CAUTION ! If water is not available, check the LLH100 module temperature until desired operating temperature is reached. The unit has a reduced laser temperature range under reduced heat sinking conditions. The unit may become very hot, overheat and be destroyed. A radiator and possibly a fan might be neces- sary to increase the laser operating tempera- ture range.

[3] Turn on the TCU151 instrument (6).

Note: Set the desired temperature by ﬁrst push- ing the switch (3) to Setting ◦C to display the objective temperature and turn the 5 turn knob

(1)to change it. Turning the switch (3) to Real ◦C, the display shows the present tem- perature.

Note: To remote control the LLH100 tempera- ture, set the switch (5) to external and provide a voltage on the External reference (7) from -6.5V (-65 ◦C) to + 6.5V (+65 ◦C).

[4]Plug the banana cables into the power sup- ply unit and set output voltage to zero and the compliance current to 100mA if pulsing a QCL.

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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 IntroductionGeneral safety instructions Environmental conditionsCompliance and informa- tion 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 currentLaser peak voltage Average dissipationAccuracy considerations 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 itemsSetting the appropriate AC voltage on TCU151 Procedure110-120V, 60Hz USA 220-240V, 50Hz Europe Before beginning Installing the starter KitConnecting Starter Kit QCL pulse timing unit com- mand description UseTCU151 temperature controler front panel TCU151 command descriptionLaser utilisation OverviewProceedings 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 laserMaintenance How to remove the covers of TCU151 and TPG128Overview 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 P92Current adjustment → Value displayed ≤ 1A→ Value displayed should tend to the deﬁned value → 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 detectionAppendix Bias Circut Bias-TGeneral 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