Quantum Instruments Cascade Laser Starter Kit manual Installing the starter Kit, Before beginning

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Starter Kit Instruction Manual

Installation

28

5.5Installing the starter Kit

5.5.1Before beginning

Make sure that the following devices are turned

OFF:

•TPG128

•TCU151

•User DC power supply

5.5.2Procedure

To install the QCL Starter Kit, proceed as follows:

[1]Plug the low impedance line into the LLH100 connector (2). The line connector is coded.

CAUTION ! Pay attention about the con- nection’s polarity. The laser must be ﬂoating from ground for both anode and cathode.

[2]Plug the low impedance line into the QCL pulser switching unit low impedance output

(1)paying attention for the polarity.

OFF

TP

G

1

Po

O

N

28

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wer

−

TL

Pul

−−

0.2

se

G

+1

− −

to

−−

0.

en

ax60mA

0 V2V

−−Perio

5 t5ot10o 12.02.5ms erator

d −

5 msms

0

−−−

to

200n

Gate

50o

−−

−−−

IN

hms

s

T

50

ohms

−

rig

OU

T

Dur

50 atio

Out1

ohms

Out2

1

Z50

Ohm

A/V,

12V

60V

Monitor

20

Inputsupply

Max

Power

control

Voltage

High hi

Current

+ to

Bottom

top, on

Output Pulseconnected

LDD

100

e

TCU151mper

at

ureC

on

tro

ller

2

Fig.16: Installing the Quantum Cascade Laser Starter Kit

Image 29

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 IntroductionCompliance and informa- tion General safety instructionsEnvironmental conditions 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 currentAccuracy considerations Laser peak voltageAverage dissipation 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 items110-120V, 60Hz USA 220-240V, 50Hz Europe Setting the appropriate AC voltage on TCU151Procedure Before beginning Installing the starter KitConnecting Starter Kit QCL pulse timing unit com- mand description UseTCU151 temperature controler front panel TCU151 command descriptionProceedings Laser utilisationOverview 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 laserOverview MaintenanceHow to remove the covers of TCU151 and TPG128 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 P92→ Value displayed should tend to the deﬁned value Current adjustment→ Value displayed ≤ 1A → 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 detectionGeneral AppendixBias Circut Bias-T 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