OPERATIONS
Connecting to the Laser Controller
7/01 LDC-3700 Series 13
CHAPTER 2
Connecting the Laser Current Source
The 9−pin connector marked CURRENT SOURCE on the back panel of your Controller, is used to
connect your laser diode to the controller. There are connections provided for laser cathode and
anode, photodiode cathode and anode, chassis ground and interlock. The pinout diagram for this
connector is shown in Figure 2.2 on page 13.
Make sure the laser current and voltage measurement connections are correct: connect pin 4,
Cathode Voltage Sense, and pin 5, Laser Cathode, to the laser diode cathode; and connect pin 8,
Anode Voltage Sense, and pin 9, Laser Anode, to the laser diode anode.
Figure 2.2 Back Panel LD Connector
Interlock Connections
In order for the laser output to be enabled, a short must exist between the Interlock pins (pins 1 and
2) of the connector. The short can be a direct short across the pins or a switch to prevent laser
operation until the switch is closed. If a short does not exist between these two pins, the
INTERLOCK LED illuminates on the front panel and the laser output is disabled.
The interlock terminals on the LASER connector, pins 1 and 2, must be kept isolated
from all other connections including earth ground.
Photodiode Connections
Many laser diode modules contain an internal photodiode that monitors the back−facet emission of
the laser. Usually, this photodiode is internally connected to either the laser anode or cathode.
The photodiode and laser connections to the LDC−3700B Series Laser Diode Controller are
electrically isolated from ground and each other. So, if a 4 pin connection is made (no common
connections) no additional jumpers are required. Figure 2.1 on page 12 shows the recommended
connections and shielding for 3−pin lasers (where the common connection is internal to the device).
A 4−pin laser should be connected with the same shielding as shown in Figure 2.1 on page 12, but
the common connection (between the photodiode and the laser) is optional.
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