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Compact recording of the appearance of surfaces and thin films

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Abstract

For improvement of optical surfaces and reflectivity enhancing films and for comparison with their appearance after use or testing, it is necessary to observe and record the nature of a surface or film with high resolution. Modifications of standard Twyman-Green and knife-edge testing methods are presented which meet this need. The appearance of flat surfaces of 40-mm diam can be preserved on a single photographic emulsion. Examples showing film defects due to reflectivity or phase changes with resolution of a few microns are presented.

© 1981 Optical Society of America

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