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Chapter 5 Operation 53
53
6. Make sure that the spectroscopy-mount adapter moves freely at the spectrograph.
7. Select Align Spectrometer… from the Experiment Options menu. Review
the displayed information and then click on the Begin button. Typically, this
feature creates three 1-row high ROIs (one near the top of the array, one in the
middle, and one near the bottom) and begins data acquisition. Data will be
continuously acquired and displayed but will not be stored.
Figure 20. Spectrometer Alignment: Before Rotational Alignment
8. Slowly move the camera in and out of focus. You should see the spectral line go
from broad to narrow and back to broad. Leave the camera set for the narrowest
achievable line. Note that the Peak Finding function is active for the center graph
to allow you to monitor the FWHM information to achieve the narrowest line
width.
The way focusing is accomplished depends on the spectrograph, as follows:
Long focal-length spectrographs such as the Acton SP-2300: The
mounting adapter includes a tube that slides inside another tube to move the
camera in or out as required to achieve optimum focus.
Short focal-length spectrographs: There is generally a focusing
mechanism on the spectrograph itself which, when adjusted, will move the
optics as required to achieve proper focus.
No focusing adjustment: If there is no focusing adjustment, either
provided by the spectrograph or by the mounting hardware, then the only
recourse will be to adjust the spectrograph’s focusing mirror.