Two-wavelength sinusoidal phase/modulating laser-diode interferometer insensitive to external disturbances
- 1 October 1991
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 30 (28) , 4040-4045
- https://doi.org/10.1364/ao.30.004040
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 μm provided by two single-frequency laser diodes, we can measure the distance, rotation angle, and surface profile measurements with great accuracy.Keywords
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