ILX Lightwave LDC-3926339 User Manual page 70

LASER:MDI
Parameters
Notes
Examples
LASER:MDI?
Parameters
Notes
Examples
LASER:MDP
Parameters
Notes
Examples
LASER:MDP?
Parameters
Notes
Examples
02_03
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The LASER:MDI command sets the laser monitor photodiode current (MDI) setpoint.
An <nrf value> which represents the photodiode current setpoint, in µA.
In constant monitor diode current ("MDI") mode, the output current is controlled so that the monitor
diode current remains constant at the MDI setpoint. See the "Laser:Mode" command for more
information.
Monitor diode current is sometimes referred to as "photodiode feedback current". On the front
panel, monitor diode current is referred to as IPD.
Laser:Mdi 40-action: The laser monitor photodiode current setpoint is set to 40 µA.
Laser:MDI 200.5-action: The laser constant-monitor photodiode current setpoint is set to 200.5 µA.
The LASER:MDI? query returns the value of the laser photodetector (monitor photodiode) current
measurement, in µA.
None. The response is an <nrf value>.
The response is in µA, and is valid even when the unit is not in MDI mode.
This measurement is updated approximately once every 600 msec.
Laser:MDi?-response: 57.3, means 57.3 µA of photodetector current was measured in the laser
monitor photodiode circuit.
The LASER:MDP command sets the value of the laser optical power set point, in mW.
An <nrf value> which represents the optical power setpoint, in mW.
In constant optical power ("MDP") mode, the output current is controlled so that the optical power
remains constant at the MDP setpoint. See the "Laser:Mode" command for more information.
If CALPD is 0, the actual MDP set point will be approximately 0.
On the front panel, the monitor photodector power is referred to as PPD.
Laser:Mdp 40-action: The laser power setpoint is set to 40 mW.
The LASER:MDP? query returns the value of the laser photodetector power measurement, in mW.
None. The response is an <nrf value>.
The response is in mW. The response is valid, even when the unit is not in constant power mode.
This measurement is derived from the monitor photodiode current (MDI): it is calculated by dividing
MDI by CalPD. If CalPD is 0, this query returns a -1.0. This measurement is updated approximately
once every 600 msec.
Laser:MDp?-response: 100.0, means Laser's optical power is calculated to be 100 mW.
C O M M A N D R E F E R E N C E
GPIB Command Reference
4
C H A P T E R
53
LDC-3926339