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Diode-laser-based high-precision absolute distance interferometer of 20 m range

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Abstract

We present a hybrid absolute distance measurement method that is based on a combination of frequency sweeping, variable synthetic, and two-wavelength, fixed synthetic wavelength interferometry. Both experiments were realized by two external cavity diode lasers. The measurement uncertainty was experimentally and theoretically demonstrated to be smaller than 12μm at a measurement distance of 20m.

© 2009 Optical Society of America

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