C O M M A N D R E F E R E N C E
GPIB Command Reference
02_03
LDC-3926339
43
C H A P T E R
4
in power monitors, and is typically called "Monitor Detector Responsivity." The monitor produces a
current when the laser illuminates it, and this current will increase with increasing laser optical
power. Manufacturers of laser modules with integrated monitors may specify the responsivity of the
monitor in terms of the laser optical power and the resulting monitor current. For example, a
responsivity may be specified as 5
µ
A/mW, meaning that to produce a monitor current of 5
µ
A, the
laser optical power must be 1 mW. Typically, the specified responsivity is entered into the current
source as CalPD, using the Laser:CalPD command.
If this parameter is set to 0, the module will not calculate the optical power. It will display
"-----" on the front panel, and GPIB queries of the optical power, using the "Laser:mdp?" query, will
return -1.0.
Examples
LASER:CALPD 0-action: sets the CAL PD parameter to 0.
Laser:Calpd 10.0-action: sets the CAL PD parameter to 10 microamp/milliwatt. A photodiode
feedback current of 10
µ
A will cause the measured optical power to be
1 mW.
The LASER:CALPD? query returns the value of the laser photodiode feedback responsivity (CalPD
parameter) setting.
Parameters
None. The response is an <nrf value>.
Notes
If this value is 0, the front panel Ppd will display "-----", and measured optical power (read with GPIB
using the "Laser:mdp?" query) will be -1.0.
Examples
Laser:CALPD?-response: 1.1, means the laser CalPD is set to
1.10
µ
A/mW: a photodiode feedback current of 2.2
µ
A represents 2 mW of optical power.
The LASER:CAL: command path is used to access the laser calibration commands.
The following commands may be reached directly from the LASER:CAL: command path.
The LASER:CAL:ABORT command is used to exit the laser calibration procedure without changing
the calibration values.
Parameters
None.
Notes
If this command is issued while the LDC-3926339 Series Laser Diode Current Source is in a Laser
calibration, the calibration will be terminated and the module will operate with the same calibration
values as before the calibration mode was started.
This command is intended for use after a false or invalid calibration value is entered, or to exit
calibration mode before any values have been entered.
Examples
Laser:CAL:ABORT-action: the module exits calibration mode.
LASER:CALPD?
LASER:CAL
•
LASER:CAL:ABORT
•
LASER:CAL:DEFAULT
•
LASER:CAL:LDI
•
LASER:CAL:LDV
•
LASER:CAL:MDI
•
LASER:CAL:MEAS
•
LASER:CAL:STATUS?
•
LASER:CAL:VALUE?
LASER:CAL:ABORT
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