Self-mixing type of phase-locked laser diode interferometer

Takamasa Suzuki; Shigeyuki Hirabayashi; Osami Sasaki; Takeo Maruyama

doi:10.1117/12.279138

1 November 1997 Self-mixing type of phase-locked laser diode interferometer

Takamasa Suzuki, Shigeyuki Hirabayashi, Osami Sasaki, Takeo Maruyama

Proceedings Volume 3134, Optical Manufacturing and Testing II; (1997) https://doi.org/10.1117/12.279138
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

A new type of phase-locked laser diode interferometer which uses self-mixing interference in the optical system is described. The self-mixing interference signal is obtained easily by the optical feedback or feeding back laser beam from the object to the laser diode. The interference signal can be detected by a photodiode which is in the package of the LD. Therefore, a beam splitter, reference mirror and external photodetector are not required, and a kind of interference signal is obtained by a simple optical system. But the signal is not the same as that which is obtained in a conventional interferometer. We used the phase-locked technique to measure the phase change in the self-mixing interference signal. This technique enables us to detect the displacement of an object. We describe our principle, experimental setup, and experimental results.

Citation Download Citation

Takamasa Suzuki, Shigeyuki Hirabayashi, Osami Sasaki, and Takeo Maruyama "Self-mixing type of phase-locked laser diode interferometer", Proc. SPIE 3134, Optical Manufacturing and Testing II, (1 November 1997); https://doi.org/10.1117/12.279138

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