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Robust single-sideband-modulated Raman light generation for atom interferometry by FBG-based optical rectangular filtration

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Version 2 2023-06-08, 12:55
Version 1 2023-01-12, 15:38
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posted on 2023-06-08, 12:55 authored by Guochao Wang, Yaning Wang, Kang Ying, Huankai Zhang, Xu Zhang, Qixue Li, Xuan Li, Enlong Wang, Xiao Yu, Aiai Jia, Shuhua Yan, Jun Yang, Lingxiao Zhu
Low-phase-noise and pure-spectrum Raman light is vital for high-precision atom interferometry by two-photon Raman transition. A preferred and prevalent solution for Raman light generation is electro-optic phase modulation. However, phase modulation inherently brings in double sidebands, resulting in residual sideband effects of multiple laser pairs beside Raman light in atom interferometry. Based on a well-designed rectangular fiber Bragg grating and an electro-optic modulator, optical single-sideband modulation has been realized at 1560 nm with a stable suppression ratio better than -25 dB despite of intense temperature variations. After optical filtration and frequency doubling, a robust phase-coherent Raman light at 780 nm is generated with a stable SNR of better than -19 dB and facilitates measuring the local gravity successfully. This proposed all-fiber single-sideband-modulated Raman light source, characterized as robust, compact and low-priced, is practical and potential for field applications of portable atom interferometry.

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