Abstract
We describe a variation of the liquid-flat technique for
determining the absolute flatness of a 240-mm-diameter optical surface
to an accuracy better than 1/100λ in both its horizontal
(three-point support) and vertical orientations. Using the
appropriate mathematics to calculate the surface deformation of a disk
due to gravity, we achieved verification of the method by comparing
measurements carried out on a pair of optical flats and a liquid
reference surface.
© 1998 Optical Society of America
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