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Two-wavelength sinusoidal phase/modulating laser-diode interferometer insensitive to external disturbances.

Authors
  • Sasaki, O
  • Sasazaki, H
  • Suzuki, T
Type
Published Article
Journal
Applied optics
Publication Date
Oct 01, 1991
Volume
30
Issue
28
Pages
4040–4045
Identifiers
DOI: 10.1364/AO.30.004040
PMID: 20706501
Source
Medline
License
Unknown

Abstract

We describe a two-wavelength laser-diode interferometer that is insensitive to external disturbances such as fluctuations in the wavelength of the laser diode and mechanical vibrations of the optical components. In sinusoidal phase-modulating interferometry this insensitivity is easily obtained by controlling the injection current of the laser diode with a feedback control system. Using an equivalent wavelength of 152 microm provided by two single-frequency laser diodes, we can measure the distance, rotation angle, and surface profile measurements with great accuracy.

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