Abstract

Uniform tint in multiple beam interferometry is a most sensitive method for detecting angular displacement between two flat surfaces. But as the sample size decreases, results become less accurate. To achieve a uniform dark tint, which is more sensitive than is a light tint, one must align the mirror axially. The accuracy of the instrument is increased by incorporating a stepped mirror. The steps are approximately λ/20 high and preferably of concentric geometry. The stepped surface provides at least one part of the total surface having the uniform dark tint condition. Setting accuracy of 0.01 sec of arc is easily achieved.

© 1969 Optical Society of America

A Method for Mapping and Determining the Surface Defects Function of Pairs of Coated Optical Flats

I. J. Hodgkinson
Appl. Opt. 8(7) 1373-1378 (1969)

New Developments in Interferometry

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Proposed Interferometric Method of Measurement of Roughness and Autocorrelation Function in Smooth-Finished Surfaces

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