Two-wavelength laser diode interferometry with one phase meter

Ribun Onodera; Yukihiro Ishii

doi:10.1117/12.211860

14 June 1995 Two-wavelength laser diode interferometry with one phase meter

Ribun Onodera, Yukihiro Ishii

Proceedings Volume 2544, Interferometry VII: Techniques and Analysis; (1995) https://doi.org/10.1117/12.211860
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

Citation Download Citation

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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