20 • General Operation
NEW FOCUS, Inc.
Performing Wavelength Scans
The Vidia-Discrete has two scan modes: automated step-scan mode,
and interactive step-scan mode. Step scans allow you to dwell at evenly
spaced wavelengths during a scan. You control the start and stop
wavelengths and the step size. In the automated mode, you program a
set dwell time, in interactive mode the laser waits for you to trigger
each step.
Some scan parameters are only available through computer control.
Using the front panel you can only set start and stop wavelengths, start
interactive step scans, and step through an interactive step scan.
The system always scans from shorter to longer wavelengths.
Setting the Start and Stop Wavelengths
1. Display the current start wavelength by pushing up the
Start/Stop
λ
switch.
2. While still holding the switch up, turn the
Wavelength Adjust
knob
to change the start wavelength.
3. Push the
Start/Stop
λ
switch down to display the current stop
wavelength.
4. While still holding the switch down, turn the
Wavelength Adjust
knob to change the stop wavelength. The stop wavelength must be
larger than the start wavelength.
5. Release the switch.
6. If the laser is in track mode, switch to scan mode by pressing the
Track
button. The laser will then tune to the start wavelength.
You cannot change the start or stop wavelengths during a scan.
Starting a Step Scan
From the front panel, you can only start interactive scans.
1. If the laser is in track mode, press the
Track
button to switch the
laser to scan mode (the light in the
Track
button should be off).
Note:
Note:
64X7 rev E.fm Page 20 Tuesday, April 3, 2001 4:16 PM
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