THORLABS LDM21, Руководство пользователя

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LDM21 Chapter 3: Setup
TTN013394-D02 Page 4
1. The four sockets comprising the laser diode connector are through-hole
type sockets with a blind clearance of 0.48” measured from the front
face of the copper cold plate. It is not necessary to trim the laser diode
leads prior to mounting into this connector unless they are longer than
0.48”.
2. The laser connector is located close enough to the front face of the
copper cold plate to allow easy installation of short-leaded lasers. The
clearance area around the LD and PD sockets is sufficient to prevent
the pins from contacting the cold plate.
3. Most laser diodes are three pins with the case tied to one of the laser
pins and also to one of the photodiode pins. The other laser and
photodiode pins will be isolated from the case. The LDM21 was
designed to operate the laser case at ground potential, therefore this
common pin will be inserted into either the 12 o’clock or the 6 o’clock
position of the laser connector. Locate the isolated laser pin and insert it
in the 3 o’clock position. The isolated photodiode should now be in the 9
o’clock position. Refer to Fig. 3. (Orient the mount with the PD polarity
switch above the LD socket).
4. The LDM21 Mount is also compatible with style E and style H laser
diodes, which do not have a photodiode; they have only a laser diode
and a ground pin. They can therefore be set up the same as style A (LD
Anode Ground) or style B (LD Cathode Ground) respectively.
5. Replace the laser mounting flange and the cover. Install both screws
through the mounting flange and loosely into the mount. Carefully
tighten each screw a little bit at a time until the flange is just snug. Do
not over-tighten either screw- the flange should sit slightly above the
cold plate. Reinstall the cover using the four 2-56 cap head screws
provided.
Figure 3 LD and PD Orientation
G
G
LD PD