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Absolute Ritchey-Common Test for Circular Flats

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The Ritchey-Common test is often used to test diagonal plane mirrors used as beam steering devices in front of large telescopes and several papers have been written about how to analyze the circular wavefronts resulting from these tests that have a near circular pupil.1,2 In this paper we address the problem of analyzing the oval shaped wavefront that results when a circular flat is tested in a Ritchey-Common configuration so that we can find the absolute figure of the flat. The procedure will be described in terms of Zernike polynomials but the method can be used for pure phase map data such as that obtained from phase measuring interferometers.

© 1996 Optical Society of America

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