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Following is an example of a Zygo Interferogram that is supplied with all OTAs
manufactured by Optical Guidance Systems.
(An interferogram is a CCD camera recording of an optical interference
pattern caused from laser light beam shearing between the incoming and outgoing
beam of the interferometer. The straighter the lines, the better the optics.)
Surface Contour Map
This map shows high and low areas on 20" f/8
Ritchey-Chretien test mirror with a total wavefront deviation of .18 waves
peak-to-valley and .031 waves R.M.S.
Fringe Analysis Sheet
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