THORLABS LDM21, Руководство пользователя

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LDM21 Chapter 5: Troubleshooting
TTN013394-D02 Page 12
Chapter 5 Troubleshooting
1. Laser Driver will not enable.

If you are using our laser and TEC controllers with our LDM21
mount, make sure that both cables are fully inserted into their DB9
connectors.
2. Laser wavelength or power is unstable even though the TEC controller
shows a stable temperature.

Make sure that your laser diode is fully inserted into the LDM21
laser socket and that its body is in full contact with the copper cold
plate.

Make sure that that the appropriate mounting flange is installed
over your laser. There are two different flanges; one specifically for
5.6 mm diodes and one for 9 mm diodes.
3. The LDC series laser driver indicates an “Open Circuit” alarm when I try
to enable the laser.

The LD and PD polarity switch settings are incorrect. Refer to Fig. 1
and the data sheet for your specific laser diode to ensure the
proper settings. The LD polarity switch setting on your LDM21 must
also match the LD polarity switch on the rear panel of your LDC
series laser diode controller.

The laser diode is installed into the wrong pins on the laser diode
socket. Refer to Fig. 2 (see page 5) for the correct orientation of the
laser diode pins and compare this to the data sheet for your laser
diode.
4. My laser diode does not have an integrated photodiode. How does it get
installed, and how do the polarity switches get set?

If your laser diode has one of its two active leads common to the
case of the laser, that lead must be connected to one of the “G”
sockets on the laser diode connector (refer to Fig. 2, page 5) while
the other pin is connected to the “LD” socket in the 3 o’clock
position. Depending on the pin orientation of your laser, you might
be using either the “G” socket at 12 o’clock or the “G” socket at 6
o’clock. Refer to your laser diode data for pin orientation. If your
cathode pin is common to the body of your laser diode, set the LD
polarity switch to “CG”. If your Anode pin is common to the body of
your laser diode, set the LD polarity switch to “AG”. The setting for
the PD polarity switch is irrelevant.
If you still have problems or questions regarding the operation of your LDM21,
please contact Thorlabs Tech Support.