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Proceedings Paper

Two-wavelength laser diode interferometry with one phase meter
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Paper Abstract

A two-wavelength laser-diode interferometer has been constructed that is based on heterodyne detection with one phase meter. Two laser diodes are frequency-modulated by mutually inverted sawtooth currents on an unbalanced interferometer. The tested phase at a synthetic wavelength can be measured from the sum of interference signals with equal beat frequencies in opposite sign. The experimental results are shown to measure the displacements longer than an optical wavelength with the resolution of a 4.7-micrometers synthetic wavelength. The periodic phase error is theoretically investigated and is experimentally verified.

Paper Details

Date Published: 14 June 1995
PDF: 9 pages
Proc. SPIE 2544, Interferometry VII: Techniques and Analysis, (14 June 1995); doi: 10.1117/12.211860
Show Author Affiliations
Ribun Onodera, Univ. of Industrial Technology (Japan)
Yukihiro Ishii, Univ. of Industrial Technology (Japan)

Published in SPIE Proceedings Vol. 2544:
Interferometry VII: Techniques and Analysis
Malgorzata Kujawinska; Ryszard J. Pryputniewicz; Mitsuo Takeda, Editor(s)

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