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Appl Opt. 1991 Oct 1;30(28):4040-5. doi: 10.1364/AO.30.004040.

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


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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