ILX Lightwave LDC-3700B Series - Page 95

COMMAND REFERENCE
Command Reference
80 LDC-3700 Series
CHAPTER 4
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The LASer:MDI command sets the value of the optical power set point, in µA, if the CALMD (CAL PD) responsivity is
0.
Parameters An <nrf value> which represents the photodiode feedback current, in
µ A.
Notes If the CALMD (CAL PD) parameter is not set to 0, the LAS:MDI value will not be used. In this case,
the measured MDI would be converted to MDP (P
PD
, by the CAL PD factor), and the MDP (P
PD
) set
point would be used.
Examples "Las:Mdi 40" −action: The LASER output is controlled so that the photodiode feedback current
remains constant at 40 µA.
"Laser:MDI 200" −action: The LASER output is controlled so that the photodiode feedback current
remains constant at 200 µA.
The LASer:MDI? query returns the value of the laser photodetector current measurement, in µA.
Notes The response is in µA. The response is valid, even when the unit is not in constant P mode.
This measurement is updated approximately once every 600 msec.
Examples "Las:Mode:MDP; Las:Calmd 0; Las:MDi?" −response: 100.0, means 100 µA of photodetector
current. This feedback is controlling the laser current output.
"LAS:MODE:IHBW; LAS:MDI?" −response: 20.0, means 20 µA of photodetector current, but
photodiode monitor current is not controlling the laser output current.
The LASer:MDP command sets the value of the optical power set point, in mW, if the CALMD (CAL
PD) responsivity is greater than 0.
Parameters An <nrf value> which represents the photodiode feedback power, in mW.
Notes If the CALMD (CAL PD) parameter is set to 0, the LAS:MDP value will not be used. In this case, the
measured MDP would be invalid, and the MDI (I
PD
) set point would be used.
Examples "Las:Mdp 40" −action: The LASER output is controlled so that the photodiode feedback power
remains constant at 40 mW.
"Laser:MDP 200" −action: The LASER output is controlled so that the photodiode feedback power
remains constant at 200 mW.
LASer:MDI
COMMON
DEVICE DEPENDENT
FRONT PANEL
LASer:MDI?
COMMON
DEVICE DEPENDENT
FRONT PANEL
LASer:MDP
COMMON
DEVICE DEPENDENT
FRONT PANEL
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