Photo-birefringent effects of crystalline coatings in ultra-stable cavities

Xian-Qing Zhu; Xing-Yang Cui; De-Quan Kong; Hai-Wei Yu; Xiao Jiang; Ping Xu; Han-Ning Dai; Yu-Ao Chen; Jian-Wei Pan

doi:10.1117/12.3007859

24 November 2023 Photo-birefringent effects of crystalline coatings in ultra-stable cavities

Xian-Qing Zhu, Xing-Yang Cui, De-Quan Kong, Hai-Wei Yu, Xiao Jiang, Ping Xu, Han-Ning Dai, Yu-Ao Chen, Jian-Wei Pan

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 1293541 (2023) https://doi.org/10.1117/12.3007859
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

To obtain a narrow linewidth ultra-stable laser for strontium atomic optical clocks, a laser is usually locked to a low-thermal-noise ultra-stable cavity with crystalline coatings through Pound–Drever–Hall (PDH) frequency locking technique. However, crystalline coatings in ultra-stable cavities have been observed with obvious birefringence properties in recently research. In our work, by comparing the incident light between two orthogonal polarization eigenmodes aligned with the slow and fast axes, we investigate photo-birefringent effects on our 30-cm-long room-temperature ultra-low-expansion (ULE) cavity to figure out the noise contribution of frequency. We measured that the light-power sensitivity in the fast axis has a lower value than the slow axis in different modulation frequencies, owing to its opposite contributions from thermal expansion noise and birefringent noise. Finally, we estimated that the noise contribution of incident light aligned with the fast axis is below the thermal noise floor.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xian-Qing Zhu, Xing-Yang Cui, De-Quan Kong, Hai-Wei Yu, Xiao Jiang, Ping Xu, Han-Ning Dai, Yu-Ao Chen, and Jian-Wei Pan "Photo-birefringent effects of crystalline coatings in ultra-stable cavities", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 1293541 (24 November 2023); https://doi.org/10.1117/12.3007859

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