Connecting To The Laser; Connecting To The Laser - ILX Lightwave LDX-3200 Series User Manual

GPIB mode in LOCAL via front panel, or in REMOTE via GPIB
PARAMETERS not selected
CAL PD = 0 µA/mW
LIM I (high range) = 125 mA (LDX-3220), 25 mA (LDX-3210)
LIM I (low range) = 50 mA (LDX-3220), 12.5 mA (LDX-3210)
LIM V = 10 volts
LIM P = 1000 mW (LDX-3220), 200 mW (LDX-3210)
LASER output off
LASER DISPLAY enabled, in I mode
Constant I, low bandwidth mode selected
LASER display showing actual current (0.00 with output off)
LASER STEP value = 1 (see LAS:STEP command, chapter 4)
LASER Tolerance values = 1.00 mA, 1.0 seconds
LASER I Set Point = 0 mA
LASER I
LASER P
RECALL BIN number = 0
MODULATION Enabled

CONNECTING TO THE LASER

When connecting your laser or any other sensitive devices to the LDX-3200 Series Precision Current Source, we
recommend that the instrument be powered up and the LASER output be off (MODE) ON LED unlit. In this
condition, a low impedance shunt is active across the output terminals. When disconnecting devices, it is only
necessary to turn the current source output off.
It is also recommended that the connections to the LDX-3200 Series Precision Current Source output be made using
twisted wire pairs with an earth-grounded shield (see Figures 2.1 A - D). The output terminals of the instrument are
left floating relative to earth ground to suppress AC power-on/power-off transients that may occur through an earth-
ground path. If the output circuit is earth-grounded at some point (such as through the laser package and mount), the
user must be careful to avoid multiple earth grounds in the circuit. Multiple earth grounds may provide circuit paths
that induce spurious currents in the photodiode feedback circuit and output leads.
Experience indicates that should an open circuit occur during laser operation (while the LASER is ON),
the laser may be damaged by a momentary circuit break-and-remake before the final circuit break. The
cable connections to the laser must be secure enough that they will not open-circuit, should they be
jostled or bumped.
Figures 2.1A - D show the possible configurations of connecting laser diodes and photodiodes with the LDX-3200
Series Precision Current Source.
HOW TO OPERATE YOUR LDX-3200
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LDX-3200 Series DEFAULT CONFIGURATION
Set Point = 0 µA
PD
Set Point = 0 mW
PD
Table 2.1 LDX-3200 Series Default Settings
IMPORTANT
PAGE 2
CHPT 2