Multichannel Grating Phase-Shift Interferometers

Osuk Y. Kwon; Dean M. Shough

doi:10.1117/12.952387

16 July 1986 Multichannel Grating Phase-Shift Interferometers

Osuk Y. Kwon, Dean M. Shough

Proceedings Volume 0599, Optics in Engineering Measurement; (1986) https://doi.org/10.1117/12.952387
Event: 1985 International Technical Symposium/Europe, 1985, Cannes, France

Abstract

When a beam is focused into grating elements, it is diffracted and phase-shifted. These fundamental characteristics of gratings have been found very useful for converting conventional interferometers into real-time wavefront sensors for digital computer control and data analysis. The principle of phase-shifting interferometry has been combined with above characteristics of the gratings to produce instantaneous multichannel interferograms. Attempts have been made successfully to apply these principles to three well-known interferometers, (1) the point-diffraction interferometer, (2) the radial-shear interferometer, and (3) the double-frequency crossed-grating lateral-shear interferometer. The advantages of these new approaches are simplicity and versatility, in particular, these wavefront sensors can measure wavefronts from both continuous and pulsed sources. Optical principles and the laboratory results will be shown.

Citation Download Citation

Osuk Y. Kwon and Dean M. Shough "Multichannel Grating Phase-Shift Interferometers", Proc. SPIE 0599, Optics in Engineering Measurement, (16 July 1986); https://doi.org/10.1117/12.952387

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