Zeng Chun, Zhao Qilai, Yang Changsheng, Sun Yuxin, Li Jialong, Wang Changhe, Zheng Junjie, Yang Zhongmin, Xu Shanhui
Opt Lett. 2024 Feb 1;49(3):434-437. doi: 10.1364/OL.506859.
Single-frequency fiber lasers (SFFLs), 1083 nm, have been extensively applied in He optical pumping magnetometers (OPMs) for magnetic field detection. However, the sensitivity and accuracy of OPMs are constrained by the frequency stability of SFFLs. Focusing on this concern, the frequency-stabilized performance of the 1083 nm SFFLs is successfully improved by externally tailoring the laser linewidth to match the spectral width of the error signal in saturated absorption spectroscopy. Thereinto, a high-intensity error signal of saturated absorption is generated as a large number of He atoms with a wide range of velocities interacting with the 1083 nm laser. Consequently, the root mean square value of the fluctuating frequency after locking is effectively decreased from 24.6 to 13.6 kHz, which achieves a performance improvement of 44.7%. Such a strategy can provide a technical underpinning for effectuating an absolute frequency stabilization with higher precision based on atomic and molecular absorption spectroscopy techniques.
1083纳米的单频光纤激光器（SFFLs）已被广泛应用于用于磁场检测的氦光泵磁力仪（OPMs）中。然而，OPMs的灵敏度和精度受到SFFLs频率稳定性的限制。针对这一问题，通过外部调整激光线宽以匹配饱和吸收光谱中误差信号的光谱宽度，成功提高了1083纳米SFFLs的频率稳定性能。其中，由于大量具有广泛速度范围的氦原子与1083纳米激光相互作用，产生了高强度的饱和吸收误差信号。因此，锁定后波动频率的均方根值从24.6有效降低到13.6千赫兹，实现了44.7%的性能提升。这种策略可为基于原子和分子吸收光谱技术实现更高精度的绝对频率稳定提供技术支撑。
