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Laser Interferometers for Measuring Displacements and Determining Object Positions

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Abstract

Laser interferometers for measuring lengths, gas refraction indexes, and laser wavelengths and for determining relative object positions have been developed. The instruments are based on a traditional principle of fringe-counting interferometers; for the determination of positions a reversed aperture interferometer sensitive to light-source displacements has been used.

© 1972 Optical Society of America

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