Sinusoidal frequency modulation on laser diode for frequency stabilization and displacement measuring interferometry

Masato Aketagawa; Thanh-Tung Vu; Ryo Yamazaki

doi:10.1117/12.2191032

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24 September 2015 Sinusoidal frequency modulation on laser diode for frequency stabilization and displacement measuring interferometry

Masato Aketagawa, Thanh-Tung Vu, Ryo Yamazaki

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Proceedings Volume 9628, Optical Systems Design 2015: Optical Fabrication, Testing, and Metrology V; 96281D (2015) https://doi.org/10.1117/12.2191032
Event: SPIE Optical Systems Design, 2015, Jena, Germany

Abstract

In this paper, we propose the sinusoidal frequency modulation on a laser diode (LD) to achieve both frequency stabilization of the LD and displacement measurement with a homodyne interferometer. The central frequency of the LD is stabilized to a Doppler broadened absorption line of an iodine (I2) molecule near the wavelength of 633 nm. The frequency of the LD is modulated across the absorption line and synchronous detection is utilized to detect the absorption signal. A simple and low-cost homodyne displacement-measuring interferometer can be constructed that can attain high measurement resolution.

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Masato Aketagawa, Thanh-Tung Vu, and Ryo Yamazaki "Sinusoidal frequency modulation on laser diode for frequency stabilization and displacement measuring interferometry", Proc. SPIE 9628, Optical Systems Design 2015: Optical Fabrication, Testing, and Metrology V, 96281D (24 September 2015); https://doi.org/10.1117/12.2191032

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