MOGlabs FZW600, Manual

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Chapter 3. User interface
Most of the user interface is dedicated to displaying the etalon
fringes, which are important for measurement diagnostics (see
§
4.1).
The wavelength display box has selectable units, and can be resized
to increase the font size and make the measurement easier to read
from a distance.
The exposure controls on the left-hand side include a scale bar
showing the optical saturation. Both the exposure time and camera
gain can be manually adjusted, although in most scenarios the auto-
exposure algorithm will optimise these values.
The
convergence monitor
on the lower-left indicates how stable the
iterative measurement is. In most situations the bars should re-
main below the dotted line, indicating that the iterative algorithm
is converging reliably. In situations where the laser wavelength is
changing rapidly, or the calibration has been perturbed, the bars
may exceed the indicated region indicating the reliability of the me-
asured value is reduced.
3.3.1 Time-series measurement
Clicking the
Time-series
button on the lower-left of the window
brings up a dialog that shows how the measured wavelength is chan-
ging over time (Figure 3.5). This can be beneficial for measuring
long-term drifts in laser wavelength, such as diagnosing laser locks.
3.3.2 Scan-range measurement
The time-series feature can also be used to display rapid measure-
ments, where the
measurement interval
is set to zero. This can be
useful, for example, to measure the mode-hop free scan range of a
tunable laser (Figure 3.6). Note that at the end of the laser scan,
the wavelength changes very rapidly and can cause the wavelength
to vary non-trivially
during
the camera exposure, which may cause
a “jump” in the measured wavelength at this point.