© 2015 Thorlabs
3 Operating Instruction
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3 Operating Instruction
3.1 External Connections
Prior to switch on the LDC200C Series controller, all required external connections must be
made properly. Please read the following sections carefully.
3.1.1 Laser Diode Output
The Thorlabs LDC200C Series controller can drive all laser diodes depending on the model up
to a maximum current of 4 A.
If a Thorlabs laser mount is used, just connect the 9-pin D-Sub jack "LD OUT"
of
LDC200C Series controller to the 9-pin plug "LD DRIVER" of the Laser Diode Mount using the
supplied shielded cable CAB400.
If a Thorlabs laser mount TCLDM9 or LDM21 is used, in addition the polarity of laser diode and
photodiode must be set using the two slide switches at the laser mount. Please refer to the
individual operation manual of the laser diode mount.
If other laser diode fixtures are used, connect the laser diode and - if provided - the photodiode
using shielded cables to "LD OUT" (R6) according to the pin assignment as shown below:
Pin assignment of the "LD OUT" jack (female, rear panel view)
Pin #
Connection
Interlock (open circuit monitoring, status display)
1
interlock and status LASER ON / OFF
5
ground for pin 1
Laser Diode
7
laser diode cathode (in case of polarity "anode grounded" - AG)
8
laser diode anode (in case of polarity "cathode grounded" - CG)
3
laser diode ground
Photodiode
2
photodiode cathode
4
photodiode anode
Note
Do not connect the laser diode between pin 7 and 8! The correct connection must be:
·
for laser diode "AG": cathode to pin 7, anode to pin 3, pin 8 - open
·
for laser diode "CG": anode to pin 8, cathode to pin 3, pin 7 - open.
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