Quantum Instruments Cascade Laser Starter Kit manual QCL pulser timing unit TPG128

Page 25

Starter Kit Instruction Manual

Description

24

4.7QCL pulser timing unit (TPG128)

4.7.1Description

The QCL pulser timing unit is designed to control the QCL pulser switching unit.

It provides TTL pulses on 50Ω on two indepen- dent outputs. The pulse duration is adjustable from 0 to 200ns. The interval between pulses can be ad- justed between 200ns and 105µs in 3 ranges.

A TTL level Gate in input and Trigger out output have also been included. The trigger pre- cedes the output pulse by about 100ns.

The QCL pulser timing unit includes the +12VDC power supply needed by the QCL pulser switching unit by means of a Lemo 00 connector with the +12V on the centre wire.

 

 

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Fig.10: QCL pulser timing unit

! Warning !

Although the pulser system is capable of delivering pulses with lengths up to 200 ns, and duty cycles up to 50%, the laser may not withstand this! The laser shall only be op- erated under conditions as specified in the datasheet or by Alpes Lasers directly: all other operation may result in destruction of the laser and loss of warranty.

4.7.2Specifications

Voltage : . . . . . . . . . . . . . . . . . . . . . . . . . 220V-240V

Frequency : . . . . . . . . . . . . . . . . . . . . . 50Hz-60Hz

Output voltage (for switching unit):+12VDC

Output max current (for switching unit):150mA

Delay between pulses:

. . . . . . . . . . . . . . . . . . . . . . . . 200 ns to 2.2 µs

. . . . . . . . . . . . . . . . . . . . . . 500 ns to 10.5 µs

. . . . . . . . . . . . . . . . . . . . . . .5.1µs to 105.1 µs

trigger and logic output signals: . . . 50Ω TTL driver circuit (74128)

gate level : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TTL

Maximum duty cycle: 50% (if larger cycles are needed, the LDD100 should be fed by an exter- nal 12V power supply, not the one provided in the TPG128, or else the fuse in the TPG128 may blow).

Limitations

Caution !

The generator can not operate with a 200 ns long pulse at a 200ns repetition interval, therefore it is limited in duty factor.

The following limitations apply:

T=400ns: . . . . . . . . . . . . . . . . . . . . t max = 200ns

T=300ns: . . . . . . . . . . . . . . . . . . . . t max = 200ns

T=250ns: . . . . . . . . . . . . . . . . . . . . t max = 150ns

T=200ns: . . . . . . . . . . . . . . . . . . . . t max = 100ns

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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 IntroductionEnvironmental conditions General safety instructionsCompliance 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 currentAverage dissipation Laser peak voltageAccuracy 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 itemsProcedure Setting the appropriate AC voltage on TCU151110-120V, 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 descriptionOverview Laser utilisationProceedings 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 laserHow to remove the covers of TCU151 and TPG128 MaintenanceOverview 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 ≤ 1A Current adjustment→ 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 detectionBias Circut Bias-T AppendixGeneral 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
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