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An 852 nm Faraday laser with 8 kHz linewidth based on corner-cube retroreflector

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posted on 2023-09-13, 16:00 authored by Zhiyang Wang, Zijie Liu, Jianxiang Miao, Hangbo Shi, Xiaomin Qin, Xiaolei Guan, Zhihong Gao, Tiantian Shi, Jingbiao Chen
A single-mode Cs atom 852 nm Faraday laser based on the corner-cube reflector feedback is first demonstrated to our best knowledge. Using the corner-cube reflector as external cavity feedback in Faraday laser, the robustness can be greatly improved. This Faraday laser can always achieve laser oscillation unless the angle between incident light and the optical axis of corner-cube retroreflector is beyond the plus or minus 3{\deg} range. Furthermore, the Faraday laser achieves single-mode operation within the current range of 100 mA , and its output wavelength is automatically limited to the vicinity of the Cs atomic transition lines. The wavelength fluctuation range is limited to plus or minus 1.2 pm within 9 hours under +3{\deg} rotation angle. Moreover, the most probable linewidth is 7.97 kHz measured by heterodyne beating. The Faraday laser with high robustness as well as narrow linewidth can be widely used in quantum precision measurement fields including quantum optics, atomic clocks, atomic magnetometers, cold atoms, and atomic gravimeters, etc.

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