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14 June 1995 Two-wavelength laser diode interferometry with one phase meter
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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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ribun Onodera and Yukihiro Ishii "Two-wavelength laser diode interferometry with one phase meter", Proc. SPIE 2544, Interferometry VII: Techniques and Analysis, (14 June 1995); https://doi.org/10.1117/12.211860
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