Two-wavelength laser diode interferometer with a time-sharing heterodyne modulation

Takamasa Suzuki; Takatsugu Aizaki; Osami Sasaki; Takeo Maruyama

doi:10.1117/12.270028

27 March 1997 Two-wavelength laser diode interferometer with a time-sharing heterodyne modulation

Takamasa Suzuki, Takatsugu Aizaki, Osami Sasaki, Takeo Maruyama

Proceedings Volume 2993, Lasers as Tools for Manufacturing II; (1997) https://doi.org/10.1117/12.270028
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

A new type of two-wavelength interferometer for the measurement of absolute distance is described. Since the wavelength of the laser diode is temporally multiplexed, only one laser diode light-source is required, thus eliminating the necessity of aligning two independent optical axes. Absolute distance is calculated from the difference of the phases in the interference signals generated by each wavelength. The self-correlation function is applicable in our system for detecting this phase- difference between two kinds of interference signals, thereby, the signal processing is very simple and there is a possibility that the real-time distance measurement becomes possible in our new method.

Citation Download Citation

Takamasa Suzuki, Takatsugu Aizaki, Osami Sasaki, and Takeo Maruyama "Two-wavelength laser diode interferometer with a time-sharing heterodyne modulation", Proc. SPIE 2993, Lasers as Tools for Manufacturing II, (27 March 1997); https://doi.org/10.1117/12.270028

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