Abstract
A method for measuring a long radius of curvature with a modified
half-aperture bidirectional shearing interferometer is described. A plane
mirror of the interferometer is replaced with a test mirror, and the incident
beam is decollimated by shifting of the source to equalize the widths of the
bidirectional shearing fringes reflected from the plane and test mirrors. This
method can be applied to concave and convex surfaces.
© 1997 Optical Society of America
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