Sinusoidal Phase Modulating Laser Diode Interferometer With Feedback Control System To Eliminate External Disturbance

Osami Sasaki; Kazuhide Takahashi; Takarnasa Suzuki

doi:10.1117/12.962776

20 November 1989 Sinusoidal Phase Modulating Laser Diode Interferometer With Feedback Control System To Eliminate External Disturbance

Osami Sasaki, Kazuhide Takahashi, Takarnasa Suzuki

Author Affiliations +

Proceedings Volume 1163, Fringe Pattern Analysis; (1989) https://doi.org/10.1117/12.962776
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

Abstract

We propose a sinusoidal phase modulating laser diode interferometer which is insensitivity to vibrations of optical devices and fluctuations in the optical wavelength of the laser diode. We analyze the sinusoidal phase modulation in a laser diode interferometer, and describe the principle of the feedback control of the injection current of the laser diode to eliminate the fluctuations in the phase of the interference signal caused by external disturbances. We construct two sinusoidal phase modulating interferometers for movement measurements and surface profile measurements, respectively. The experimental results make it clear that the interferometers can be used in mechanically noisy circumstances.

Citation Download Citation

Osami Sasaki, Kazuhide Takahashi, and Takarnasa Suzuki "Sinusoidal Phase Modulating Laser Diode Interferometer With Feedback Control System To Eliminate External Disturbance", Proc. SPIE 1163, Fringe Pattern Analysis, (20 November 1989); https://doi.org/10.1117/12.962776

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