Two-wavelength sinusoidal phase/modulating laser-diode interferometer insensitive to external disturbances.
- Published Article
- Publication Date
Oct 01, 1991
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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The corresponding record at NLM can be accessed at https://www.ncbi.nlm.nih.gov/pubmed/20706501