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Applied Optics

Applied Optics


  • Vol. 18, Iss. 14 — Jul. 15, 1979
  • pp: 2364–2367

Superposition fringes as a measuring tool in optical testing

J. Schwider  »View Author Affiliations

Applied Optics, Vol. 18, Issue 14, pp. 2364-2367 (1979)

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Superposition fringes are suitable for making highly accurate measurements of the thicknesses of air layers. A combination of a multiple beam interferometer (Fabry-Perot) and a two-beam interferometer is discussed. In this case the contrast degradation is small. Two possible applications are discussed to some extent: the first deals with the adjustment of air gaps between lenses or other optical elements, and the second is a special spherical Fizeau interferometer. This interferometer makes possible surface testing of spheres with the help of interference colors or rings as is usual with the proof glass method, with radius differences of several centimeters. The latter application seems especially promising.

© 1979 Optical Society of America

Original Manuscript: June 5, 1978
Published: July 15, 1979

J. Schwider, "Superposition fringes as a measuring tool in optical testing," Appl. Opt. 18, 2364-2367 (1979)

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  14. It should be mentioned that the described technique could also be used for FECO applications in transmitted light [see, e.g., S. Tolansky, Multiple-Beam Interferometry of Surfaces and Films (Clarendon, Oxford, 1948)]. Here, the thickness of the air layer between the Fizeau plates can be several mm’s without loss of resolution in the spectroscopic evaluation, because the superposition fringes are widely spaced.

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