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Quantum Instruments Cascade Laser Starter Kit manual Threshold on, → The red LED 1 should turn oﬀ

Models: Cascade Laser Starter Kit

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Page 53

Starter Kit Instruction Manual

Maintenance

52

Miscellaneous functions testing Temperature

limit testing

[37] Decrease the temperature limit threshold

from 0.7 V to 0.3 V.

Note: For more details, see Temperature limit

threshold on page 50.

[38] Increase the temperature reference to 35

◦C.

,→ When the threshold is overpassed, the red

LED (1) in front panel should lit.

Al

[39] Wait the real temperature drops 10

◦

C

a

e

r

m

m

Re

Re

pe

S

TCU151r

s

al

at

et

et

R

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ti

C

r

below the threshold.

Ex

n

e

e

g

al

C

t

I

ern

C

ont

al

r

oll

S

e

r

et

ti

n

g

[40] Reset the instrument with the RESET

Int

+I

S

er

n

et

al

ti

button (2).

n

g

−I

,→ The red LED (1) should turn oﬀ.

1

+

[41] Reset the temperature limit threshold to

2

−

0.7 V.

3

Note: For more details, see Temperature limit

4

threshold on page 50.

Monitoring

Fig.49: TCU151 front panel

[42]Check the output voltage on the rear in- strument BNC connector (5).

Note: For 35 ◦C, the voltage should be 350 mV.

External reference

[43]Plug an external power supply to the Ex- ternal Reference BNC connector (6).

[44]Set the voltage to 3.5 V.

[45]Set the switch External/Internal (3) to External.

[46]Set the selector (4) to mode Setting ◦C.

,→ The temperature displayed (2) should be 035 ◦C.

[47] Set the selector (4) to mode Real ◦C.

,→ The temperature displayed (2) should fol- low the reference temperature.

M

O

NI

1

T

0

O

m

RI

V/

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C

M

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T

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x:

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15

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1

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USE

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25

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1

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1

rl

oc

ki

n

g

5

6

Fig.50:TCU151 rear panel

Image 53

Quantum Instruments Cascade Laser Starter Kit Miscellaneous functions testing Temperature Limit testing, Threshold on

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