THORLABS LDM56, Operating Manual, Page: 9 / 24

Temperature-Controlled Laser Diode Mounts Chapter 4: Setup
Rev C, February 20, 2018 Page 7
4.2.2. Special Note for G Style Configuration Laser Diodes
Figure 4 LDM56(/M) and LDM90(/M) Internal Circuitry Showing Jumper JP5
In order to drive a style G laser diode, the PD pin in the mount must be
grounded. The red jumper is set across the bottom and left pin for operation with
A, B, C, D, E, and H pin code laser diodes (Figure 5). The jumper is set across
the center and right pin for operation with G pin code laser diodes (Figure 6). The
G pin code setting grounds the photodiode pin which allows the mount to drive a
laser diode only (no photodiode) configuration with the LD pin at the 12 o'clock
position.
5. If the mount will be used with a G style laser diode, unscrew the four
captive 4-40 socket head screws from the front cover using a 5/64" hex
driver.
6. Locate JP5 header and move the red jumper as shown below or in the
note beside the header.
Figure 5 JP5 Position for A, B, C, D, E, & H Pin Code TO-Can Lasers
Figure 6 JP5 Position for G Pin Code TO-Can Lasers