Abstract

A digital phase-measuring interferometer with a laser-diode source has been developed that is based on a fringe-scanning technique with a stepwise wavelength change by variation of the laser injection current. The phase is changed to produce a relative phase difference between the beams in the two arms of the interferometer. Calibrated phase shifts used for a phase-extraction algorithm are derived from one-dimensional least-squares fits to cosine fringe functions to achieve accurate results. Experimental results are presented.

© 1987 Optical Society of America

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1985 (2)

1984 (1)

J. E. Greivenkamp, Opt. Eng. 23, 350 (1984).

1982 (1)

1981 (1)

1975 (1)

1974 (1)

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