23 July 1993 Analysis of low-coherence excitation of two-mode fiber in Michelson interferometer configuration
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Proceedings Volume 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology; 198380 (1993) https://doi.org/10.1117/12.2308707
Event: 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1993, Budapest, Hungary
Abstract
For interferometric distance measurements on rough surfaces multiple wavelength interferometry is a powerful tool. It allows to reduce the sensitivity and to extend the range of unambiguity for interferometric measurement. A new kind of a double wavelength heterodyne interferometer is presented which uses only one laser source which generates two wavelengths X, and X, simultaneously. The two different heterodyne frequency shifts of the double heterodyne interferometer (DHI) are achieved by combining an acousto-optical modulator (driven in suppressed carrier mode) with a fixed diffraction grating. In a first prototype a multi-wavelength Helve laser was used as light source. The synthetic wavelength A in this system is 55.5 gm and the resolution about 0.15 gm. Measurement results obtained with the setup described are presented .
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Petr Hlubina, "Analysis of low-coherence excitation of two-mode fiber in Michelson interferometer configuration", Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 198380 (23 July 1993); doi: 10.1117/12.2308707; https://doi.org/10.1117/12.2308707
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