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Fiber optic displacement sensor with subangstrom resolution

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Abstract

A simple Fabry-Perot interferometer that uses a single-mode bidirectional fiber coupler as a beam splitter is described. With light from a high stability He–Ne laser focused on the optic fiber, noise levels of 0.5-Å rms equivalent reflector displacements were obtained in a bandwidth of 0.02-1 kHz.

© 1990 Optical Society of America

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