Quantum Instruments Cascade Laser Starter Kit Manuale Utente Scaricare il pdf (Pagina 37)

Starter Kit Instruction Manual Troubleshooting 36

Laser draws current but gives no

light

- The laser may be reversed polarized (it

is not a desirable situation but does gen-

erally not destroy the laser).

√

Check the polarity of the connection.

- The po larity is right. It draws to o much

current and the power meter is misal igned.

√

Reduce the current a t the maximum

sp e c iﬁed for the operating temperature.

√

Check power meter alignement and

scale.

- The QCL laser is not used with the LLH

and is grounded.

√

Check that there is no short-circuit on

the circuit.

The laser does not draw current

- There is no contact with the laser.

√

Check that the gilded copper contact

is present and properly mounted.

√

Tighten the PET U-shap e d holder in

order to eﬀective the contact with the

laser by means of the POM ﬁxing screws.

√

Check the connections on the LLH.

Measure the input resistance w ith an ohm-

meter between the Laser connector and

the Base receptacle connector.

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Quantum Instruments Cascade Laser Starter Kit Manuale Utente Pagina 37