Burleigh WAVEMETER JR WA-2500, Operating Manual, Page: 15 / 47

Wavemeter
jr
Operating Manual 3. Operating Instructions
Burleigh Instruments, Inc. (04659-M-00 Rev E) page 3-6
Burleigh Park, Fishers, NY 14453
Figure 3.3. Monitor, Trigger and Window Outputs for Different Spectra.
3.9 AUTO-RESOLUTION FEATURE
The Wavemeter
jr
displays the wavelength or frequency to the specified accuracy of
±
1 part in 10,000 for lasers with linewidths less that 150 GHz (5 cm
-1
). Lasers with
greater linewidths exhibit reduced coherence lengths, which in turn reduces the
number of useful fringes generated in the Michelson interferometer.
The Auto-Resolution feature automatically adjusts the precision of the wavelength
or frequency display for lasers with linewidths greater that 150 GHz. The length of
the WINDOW defines the number of useful fringes actually counted by the
Wavemeter
jr
. The Auto-Resolution circuitry computes the appropriate readout based
on the accuracy implicit in the number of fringes that can be counted. Insignificant
digits are eliminated and replaced by a “_” character on the display.
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