Dong Jing, Hu Yongqi, Huang Junchao, Ye Meifeng, Qu Qiuzhi, Li Tang, Liu Liang
Appl Opt. 2015 Feb 10;54(5):1152-6. doi: 10.1364/AO.54.001152.
An ultralow-noise, subhertz 1.55 μm erbium-doped fiber laser that is locked on an all-fiber-based Michelson interferometer is presented in this paper. The interferometer uses 500 m SMF-28 optical fiber and an acousto-optic modulator to allow heterodyne detection. By comparing two identical laser systems, a 0.67 (0.21) Hz linewidth beat-note signal is achieved and we obtain fractional frequency instability of 7×10(-15) at short timescales (0.1-1 s). The frequency noise power spectral density of two identical lasers is below -1 dB Hz(2)/Hz at 1 Hz and it reaches -18 dB Hz(2)/Hz from 200 Hz to 1 kHz.
本文介绍了一种锁定在全光纤迈克尔逊干涉仪上的超低噪声、亚赫兹1.55μm掺铒光纤激光器。该干涉仪使用500 m的SMF-28光纤和一个声光调制器来实现外差检测。通过比较两个相同的激光系统，获得了0.67(0.21)Hz的线宽拍频信号，并且在短时间尺度(0.1 - 1 s)下获得了7×10(-15)的分数频率不稳定度。两个相同激光器的频率噪声功率谱密度在1 Hz时低于-1 dB Hz(2)/Hz，在200 Hz至1 kHz范围内达到-18 dB Hz(2)/Hz。
