OPERATIONS
Operating from the Front Panel
16 LDC-3700 Series
CHAPTER 2
Operating from the Front Panel
This section describes fundamentals of operation for your LDC−3700B Series Controller Laser
Current Source in two operating modes, Constant Current (I), and Constant Power (P).
The Laser Controller Display
The LASER display is used to show LASER control parameters such as laser drive current (mA),
laser current limit (mA), laser forward voltage (V), monitor photodiode current (µA), and laser optical
power (mW) in both set point and measurement modes. It will also display error codes which relate
to LASER operation. Error indicators underneath the display indicate control errors and are
explained in the section titled "LASER ERROR INDICATORS". All laser control parameters are
displayed on this portion of the controller’s display section with the appropriate enunciator
illuminated.
Operating a laser in Constant Current “I” Mode
Suppose you have an LDC−3724B Laser Diode Controller and you want to run the instrument in
Constant Current, low bandwidth mode, with a set point of 150 mA and a current limit of 175 mA.
This particular mode uses a low−pass filter on the laser drive current output to significantly reduce
noise. In this mode a modulation input of up to 10 kHz may be used, via the front panel MOD
EXTERNAL connector. Follow the instructions below in the sequence presented.
Set Up the Controller
Set the LDC−3700B in Constant Current low bandwidth mode by selecting I in the LASER MODE
section of the front panel. Do this by toggling the SELECT push button until the I indicator is
illuminated. Repeatedly pressing the (LASER MODE) SELECT switch cycles through the current (I),
light power (P), or high bandwidth current (I
HBW
) control modes.
V
mA
uA
mW uW
CU RRENT LIM IT
POW ER LIM IT
VOLTAGE
OUTPUT SHORTED
INTERLOCK
OPEN CIRCUIT
ON
OUTPUT
I
HBW
I
SELECT
LASER MOD
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