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Use SCAN Command to Sweep the Laser Output Current
Rev B. Revised Oct 2012
Figure1 Output current with the SCAN function
For LDC500 series laser diode controllers, the output current shown in Figure.1. CH2 (red trace)
SCAN command can be used to initiate an automated shows the laser current output starting from 25mA,
sweep of the laser operating point. For example, in then 125mA, through 325mA in 3 steps. The time
Constant Current mode, we set initial laser current interval of each step is 50ms. CH1 (blue race) shows
at 25mA and turn laser output ON. Through remote the 10s negativegoing TTL synchronizing pulses at
interface, RS232, GPIB or Ethernet, we send SYNC OUT BNC connector on the rear panel.
command SCAN 100, 3, 50. We'll get a stairup
Figure 2 SCAN function parameters
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As shown in Figure 2 the sync pulses delay can be receipt of the SCAN command, starting at the
changed by the command: previous setpoint.
SYND gsync ; The second parameter, i, gives the total number
of steps. Note that if I0 + i