Quantum Instruments Cascade Laser Starter Kit manual If the ambient atmosphere is humid this is

Page 42

Starter Kit Instruction Manual

Maintenance

41

[5] Place the screws (3) in the PET holder (4).

 

 

[6] Place the PET holder (4) on the two guides

 

 

(5) on the back of the laser receptacle (6)

1

 

being careful of maintaining the PET holder

 

 

higher on the laser side than on the back side.

 

 

[7] Once the holder (4) is engaged in the guides,

 

 

push it down until contact with the gilded ce-

 

 

ramic pads of the laser is established.

 

 

 

[8] Screw the PET holder (4) to the receptacle

2

 

(6).

 

 

 

[9] Verify that the contact is established by

3

 

measuring with an ohm meter on the LLH100

 

 

low impedance plug.

 

4

 

Note: For reproducible measurement be care-

 

 

ful of measuring with the positive probe on the

 

 

+ LLH100 connection.

 

5

 

Note: If the contact is bad, adjust the plas-

 

 

tic screws (7) at the pressing end of the PET

6

 

holder (4).

 

 

 

[10] Place a 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

Fig.30: Placing the PET U-shaped holder

 

in a gloves box under dry nitrogen atmosphere

 

 

 

if the ambient atmosphere is humid (this is

 

 

not necessary under normal conditions 50-60%

 

 

humidity).

 

 

 

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

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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 IntroductionGeneral safety instructions Environmental conditionsCompliance 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 calculationLaser peak voltage Average dissipationAccuracy 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 itemsSetting the appropriate AC voltage on TCU151 Procedure110-120V, 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 panelLaser utilisation OverviewProceedings 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 laserMaintenance How to remove the covers of TCU151 and TPG128Overview 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 MentCurrent adjustment → Value displayed ≤ 1A→ 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 techniqueAppendix Bias Circut Bias-TGeneral 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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