Adjustable coherence depth in a geometrically desensitized interferometer

Peter J. de Groot; Leslie L. Deck; Xavier Colonna de Lega

doi:10.1117/12.316446

6 July 1998 Adjustable coherence depth in a geometrically desensitized interferometer

Peter J. de Groot, Leslie L. Deck, Xavier Colonna de Lega

Proceedings Volume 3479, Laser Interferometry IX: Applications; (1998) https://doi.org/10.1117/12.316446
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Geometrically desensitized interferometry uses two beams at different incident angles to generate an interference pattern with an equivalent wavelength of 5 to 20 micrometers. Unlike conventional interferometers, the fringe contrast is primarily a function of the optical geometry, rather than the spectral properties of the source light. In particular, a line-shaped source provides either a narrow or broad contrast envelope, depending on the orientation of the line with respect to the plane of incidence. This adjustable coherence depth is useful for initial system alignment, depth scanning and for separating surfaces of transparent flat parts.

Citation Download Citation

Peter J. de Groot, Leslie L. Deck, and Xavier Colonna de Lega "Adjustable coherence depth in a geometrically desensitized interferometer", Proc. SPIE 3479, Laser Interferometry IX: Applications, (6 July 1998); https://doi.org/10.1117/12.316446

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