Shot-noise-limited displacement measurement with frequency-synthesized light

Peng Yang; Xuezhi Ke; Lei Zhang; Guozhen Hu

doi:10.1117/12.2604200

1 November 2021 Shot-noise-limited displacement measurement with frequency-synthesized light

Peng Yang, Xuezhi Ke, Lei Zhang, Guozhen Hu

Proceedings Volume 12057, Twelfth International Conference on Information Optics and Photonics; 120570P (2021) https://doi.org/10.1117/12.2604200
Event: Twelfth International Conference on Information Optics and Photonics, 2021, Xi'an, China

Abstract

Shot-noise-limited displacement measurement is difficultly realized by traditional optical interferometry for surface profile detection and MEMS (micro-electro-mechanical systems) manufacture, attributing to low sensitivity of Michelson interferometer and high classical noise of homodyne or direct detector. Aiming at above problems, a dark-end locking method is proposed to enhance sensitivity of phase detecting; a Mach-Zehnder interferometer is utilized to raise recycling efficiency of laser and a LO (local oscillator), dispensing with additional introduction, is obtained in reading out interferometric signal; a balanced heterodyne detector, leading to reach the shot noise limit, is designed to get rid of high low-frequency classical noise. This work will serve as a theoretical guide and experimental support for the forthcoming precision displacement measurement and sub-shot-noise audio-frequency laser interferometry experiments.

Citation Download Citation

Peng Yang, Xuezhi Ke, Lei Zhang, and Guozhen Hu "Shot-noise-limited displacement measurement with frequency-synthesized light", Proc. SPIE 12057, Twelfth International Conference on Information Optics and Photonics, 120570P (1 November 2021); https://doi.org/10.1117/12.2604200

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