17 July 1996 Feedback type of laser diode interferometer with an optical fiber
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A laser diode interferometer which uses an optical fiber is proposed. The laser diode simultaneously functions as a light source, a phase modulator, and a phase compensator. The detection of the vibration and the reduction of external disturbance are carried out, by using a feedback control for the injection current of the laser diode. So it can measure the vibration accurately in real time with a simple signal processing circuit. The optical fiber not only functions as a flexible probe, enabling us to measure the vibration of the object that cannot be moved onto the vibration absorption board, it also acts as a reference mirror, thereby simplifying the unit construction.
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Takamasa Suzuki, Takamasa Suzuki, Takao Okada, Takao Okada, Osami Sasaki, Osami Sasaki, Takeo Maruyama, Takeo Maruyama, } "Feedback type of laser diode interferometer with an optical fiber", Proc. SPIE 2860, Laser Interferometry VIII: Techniques and Analysis, (17 July 1996); doi: 10.1117/12.276309; https://doi.org/10.1117/12.276309

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