Burleigh WAVEMETER JR WA-2500, Operating Manual, Page: 7 / 47

Wavemeter
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Operating Manual 1. Introduction
Burleigh Instruments, Inc. (04659-M-00 Rev E) page 1-2
Burleigh Park, Fishers, NY 14453
Figure 1.1. Wavemeter
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Layout.
Two modes exist for the measurement cycle. In the standard mode, the
measurement is performed and displayed every 200 milliseconds. When the
AVERAGE button is depressed, the data is accumulated for 10 sequential
measurements and the display is updated with the average value every 2 seconds.
The AVERAGE mode is particularly useful for lasers that possess some frequency
jitter.
The Wavemeter
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upper front panel includes a six digit LED display and a bar-
graph intensity meter. The intensity meter indicates the peak to peak intensity of
the interferometer fringe signal, and can be used to facilitate alignment of the beam
receiver with the input laser beam. A “LO SIG” or “HI SIG” message will also be
flashed on the display when a low or high input intensity condition exists.
Three BNC coaxial connectors on the rear panel allow you to diagnose the operation
of the instrument with an oscilloscope. These are labeled MONITOR, WINDOW,
and TRIGGER. Together, they enable the user to observe the fringe signals from
the Michelson interferometer in order to align the beam receiver, optimize the
alignment of the interferometer’s adjustable mirror, and analyze the characteristics
of the laser input.
The auto-resolution feature built into the Wavemeter
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circuitry allows the
instrument to measure the wavelength of lasers with linewidths as great as 3000
GHz, despite the associated low coherence length. The auto-resolution circuitry
automatically adjusts the measurement range to be consistent with the coherence
length, and the result is displayed with relevant precision.
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