ILX Lightwave LDX-36000 Series User Manual page 126

5
C H A P T E R
LASer:OUTput?
Action
Parameters
Notes
Examples
LASer:Power <nrf value>
Action
Parameters
Notes
Examples
LASer:PDBIAS <nrf value>
Action
Parameters
Notes
Examples
110
 LDX-36000 Series
C O M M A N D R E F E R E N C E
Command Reference
Returns status of output current.
None.
Although the status of the output is enabled, the output may not have reached the
setpoint value.
"Las:OUT?" -response: 0, meaning the output has been disabled; devices may be safely
disconnected or connected to the output terminals.
"las:out?" -response: 1, meaning the output has been enabled.
Specifies the output optical power from which is calculated the current source setpoint
value.
An <nrf value> specifying the output optical power in Watts.
The specified output power is NOT a setpoint for constant power mode as is the case for
other ILX Lightwave instrumentation. Through the use of previously entered threshold
and slope efficiency values via the LAS:CALP command, the optical power specified with
the LAS:P command is used to calculate the laser current required to generate the
specified output power. This calculated value of current becomes the constant current
setpoint. See Chapter 3 for additional information.
If the laser threshold value has been set to zero (the default value), this mode is
disabled.
"LAS:CALP 0.63, 1.75; LAS:DIS:P; LAS:P 1.25" -action: enters laser threshold of 1.75 A
and slope efficiency of 0.63 W/A before changing display to show optical power output
and automatically setting output current to 3.7 A (current required to generate 1.25 W
output).
Sets the reverse bias voltage on an external photodiode connected to pins 1 and 2 of the
9-pin sense connector.
An <nrf value> specifying the reverse voltage in volts, ranging from 0.0 to 15.0.
The reverse bias on a photodetector results in a more linear response of current output
vs. light input and is recommended for best performance when generating L-I data.
The photodiode reverse bias is set either from the front panel or via GPIB.
"LAS:PDBIAS 10.1" - action: a voltage of 10.1V is set on the photodiode cathode with
respect to the anode.
C
OMMON
F P
RONT ANEL
D D
EVICE EPENDENT
C
OMMON
F P
RONT ANEL
D D
EVICE EPENDENT
C
OMMON
F P
RONT ANEL
D D
EVICE EPENDENT