Figure 31. Spectrometer Alignment: After Rotational Alignment - Princeton Instruments ProEM+ EMCCD User Manual

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9. Slowly move the camera in and out of focus. You should see the spectral peak (or
10. Tighten the two spectrograph set screws to secure the spectrograph sliding tube
ProEM

Figure 31. Spectrometer Alignment: After Rotational Alignment

Note: When aligning other accessories, such as fibers, lenses, optical fiber
adapters, first align the spectrograph to the slit. Then align the accessory without
disturbing the camera position. The procedure is identical to that used to focus
the spectrograph (i.e., do the focus and alignment operations while watching a
live image).
peaks) go from broad to narrow and back to broad. Maximize the intensity level
and minimize the FWHM of the selected peak or peaks. 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.
and stop data acquisition.
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+ System Manual Version 1.B