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Double sinusoidal phase-modulating distributed-Bragg-reflector laser-diode interferometer for distance measurement

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Abstract

A previously proposed double sinusoidal phase-modulating (DSPM) laser-diode interferometer measures distances larger than a half-wavelength by detecting modulation depth. Although it requires a vibrating mirror to provide the second modulation to the interference signal, such vibrations naturally affect measurement accuracy. We propose a static-type DSPM laser-diode interferometer that uses no mechanical modulation. Our experimental results indicate a measurement error of ±1.6 µm.

© 2003 Optical Society of America

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