Laser & Optoelectronics Progress, Volume. 61, Issue 5, 0506004(2024)
Dual-Wavelength Laser Fiber Phase Noise Suppression Based on Ultra-Cold Erbium Atoms
The additional phase noise of a sub-Hz linewidth laser transmitted in the fiber to excite the Hz-linewidth transition of erbium is actively compensated for using the fundamental laser of the cooling laser in the ultracold erbium atom system. To perform heterodyne beat detection and implement the compensation feedback without affecting the power of the original sub-Hz linewidth laser (1299 nm), we injecte the broad-linewidth fundamental laser of the cooling light at a similar wavelength (1166 nm) from the output end of the fiber. The phase noise of the narrow-linewidth laser caused by temperature and vibration in fiber transmission is suppressed when the noise of the two lasers is almost the same. The linewidth of the beat frequency signal of the transmitted laser is narrowed from 14.6 Hz to 11.6 mHz and the stability of the optical-frequency transmission link is improved from
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Wenmin Liao, Sihui Zhang, Yuqing Duan, Jie Wang, Haibin Wu. Dual-Wavelength Laser Fiber Phase Noise Suppression Based on Ultra-Cold Erbium Atoms[J]. Laser & Optoelectronics Progress, 2024, 61(5): 0506004
Category: Fiber Optics and Optical Communications
Received: Apr. 21, 2023
Accepted: May. 6, 2023
Published Online: Mar. 5, 2024
The Author Email: Wang Jie (jwang@lps.ecnu.edu.cn)