6000 Vortex Series Constant-Power Mode • 25
Constant-Power Mode
Introduction
When operating in constant-power mode, the controller adjusts the
laser current to maintain a stable output power. Only the power and
the laser’s wavelength (controlled by the piezo voltage) can be varied in
this mode. The laser power displayed in this mode is given in terms of a
percentage of maximum auxiliary-signal input.
The feedback-circuit electronics that control constant-power mode are
internal to the Vortex controller, but you will need an external
beamsplitter and photodetector to provide the controller with the
necessary electrical signal for the internal feedback circuit.
Preparing to Use Constant-Power Mode
Constant-power mode uses a feedback signal from the Auxiliary Input
to stabilize the laser’s output power. Operating the Vortex laser in
constant-power mode is a three-step process:
1. Set up an external beamsplitter to pick off a portion of the output
beam and direct it into a photodetector.
2. Feed the signal from the photodetector into the controller’s
auxiliary input.
3. Generate a setpoint, based on a percentage of the maximum
output power, using either the front panel or computer control.
The Vortex controller will compare the output measured by the
photodetector to the setpoint you entered and actively adjust the laser
current to stabilize the output power.
Vortex6000.book Page 25 Tuesday, February 19, 2002 3:25 PM
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