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Optical Engineering

Improved Oblique-Incidence Interferometer
Author(s): P. Hariharan
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Paper Abstract

An oblique-incidence interferometer for testing the flatness of fine-ground surfaces is described. This uses reflecting diffraction gratings to divide and recombine the beams, resulting in a very compact optical system. In addition, the relative amplitudes of the interfering beams can be adjusted, by a suitable choice of the grating orders used, to give fringes of excellent visibility with surfaces having a wide range of refleetances.

Paper Details

Date Published: 1 June 1975
PDF: 2 pages
Opt. Eng. 14(3) doi: 10.1117/12.7971879
Published in: Optical Engineering Volume 14, Issue 3
Show Author Affiliations
P. Hariharan, CSIRO (Australia)


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