Quantum Instruments Cascade Laser Starter Kit manual Facet on the case, it is extremely fragile

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Starter Kit Instruction Manual

Maintenance

39

[4] Install the new laser (4) into the holder

 

 

using small tweezers ( 0.5cm aperture).

 

 

 

[5] Hold the laser (4) on the gilded ceramic

1

 

 

 

pads with the tweezers pins along the axis of

 

 

the largest length of the copper submount.

 

 

 

[6] Place it in the receptacle parallel to the

 

 

window.

 

 

 

! Warning ! Avoid hitting the laser chip

2

 

facet on the case, it is extremely fragile.

 

[7] Place the screws (3) in the PET holder (5).

3

5

[8] Place the PET holder (5) on the two guides

 

 

 

(6) on the back of the laser receptacle being

 

 

careful of maintaining the PET holder higher

 

 

on the laser side than on the back side.

 

 

6

 

 

 

[9] Once the PET holder (5) is engaged in the

4

 

guides, push it down until contact with the

 

 

gilded ceramic pads is established.

 

 

 

[10] Screw it to the receptacle.

 

 

 

[11] Verify that the contact is established by

 

 

measuring with an ohm meter on the LLH100

 

 

low impedance plug.

 

 

 

Note: For reproducible measurement be care-

 

 

ful of measuring with the positive probe on the

Fig.27: Replacing the laser

 

+ LLH100 connection.

 

 

 

Note: If the contact is bad, adjust the plastic screws at the pressing end of the PET holder

(5).

Note: If the contact is bad, clean the bottom of the submount with grinding paper, be care- ful of not damaging the bonding wires and the laser facet.

[12]Place the dry desiccant bag close to the low impedance line plug. Only applicable if desiccation is needed and the lasers has been shipped with a desiccant bag.

Note: This operation is preferably performed in a gloves box under dry nitrogen atmosphere if the ambient atmosphere is humid (this is not necessary under normal conditions 50-60% humidity).

[13] Close the cover (2) with the screws (1).

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Contents Quantum Cascade Laser Starter Kit Instructions Manual Web versionContents Installation TroubleshootingMaintenance Overview UseAppendix Identification DocumentLimited waranty ManufacturerGeneral Chapter overviewGeneralities ComplianceGlossary PersonsProduct PersonnelCommands style Procedure styleTypographic conventions Description styleProblem Procedure effects styleSee page x-y Troubleshooting style Possible causePage Safety Instructions Importance of safety instructionsNon-compliance with the safety regulations IntroductionEnvironmental conditions General safety instructionsCompliance and informa- tion Description System CompositionDFB and FP Quantum Cascade Lasers If no configuration is specified, the DN pad is usedDescription 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 viewQCL pulse switching measuring unit GeneralitiesMeasured voltages 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 connectionsInstallation Chapter overview Packing listGeneral 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 utilisationTroubleshooting Power supply reaches max cur- rent for a very low voltageDC power supply is not floating PrincipleLaser 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 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 HumidityTCU151 temperature con Troller interlock setting Procedure interlock settingBefore beggining interlock set Ting Needed materialCalibaration procedures Procedure calibration1 TPG128 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 Current/Voltage ratio adjustment SettingOscillator check 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 Miscellaneous functions testing Temperature Limit testing → The temperature displayed 2 should be 035 CThreshold on → The red LED 1 should turn offApplication notes Detection techniquesDirect absorption 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
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