Abstract

A photoelectric detection scheme for a three-beam interferometer is described. The technique provides an ac measurement signal and improved sensitivity. This method makes use of a relative oscillating motion between the fringes and a slit placed in the interference pattern to produce measurement signals. Certain observations on the form of interference fringes in three-beam interference are also included.

© 1984 Optical Society of America

Improved Three-Beam Interferometric Method

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