Wang Bowen, Peng Xiang, Wang Haidong, Liu Yang, Guo Hong
State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics, and Center for Quantum Information Technology, Peking University, Beijing 100871, China.
Rev Sci Instrum. 2022 Apr 1;93(4):043001. doi: 10.1063/5.0084605.
Differential single-beam saturated-absorption spectroscopy (DSSAS) is proposed to stabilize lasing frequency and suppress Doppler-broadened background and common-mode optical noise. The spectral first-derivative demodulated signal of metastable He4 atoms is used as an error signal to stabilize a fiber laser around 1083 nm. Experimental results show that, compared with existing non-DSSAS frequency stabilization, DSSAS stabilization produces better stability and lower fluctuations, especially for frequency-noise-corrupted lasers. In DSSAS stabilization, for data acquired over 7000 s, the root mean square frequency fluctuation of the fiber laser is 16.4 kHz, and the frequency stability described by the modified Allan deviation is 4.1 × 10 at 100 s. Even for a defective laser with poor frequency stability, the proposed scheme demonstrates experimentally high capability of noise suppression and reduces the frequency fluctuations by two orders of magnitude. Given its simplicity and compact design, frequency stabilization by DSSAS is promising for quantum-sensor applications, such as atomic magnetometers, atomic gyroscopes, and atomic clocks.
提出了差分单光束饱和吸收光谱法（DSSAS）来稳定激光频率并抑制多普勒加宽背景和共模光学噪声。利用亚稳态He4原子的光谱一阶导数解调信号作为误差信号，在1083nm附近稳定光纤激光器。实验结果表明，与现有的非DSSAS频率稳定方法相比，DSSAS稳定方法具有更好的稳定性和更低的波动，特别是对于频率噪声受扰的激光器。在DSSAS稳定中，对于采集超过7000s的数据，光纤激光器的均方根频率波动为16.4kHz，修正阿伦偏差描述的频率稳定性在100s时为4.1×10 。即使对于频率稳定性较差的有缺陷激光器，该方案在实验上也表现出高噪声抑制能力，并将频率波动降低了两个数量级。鉴于其简单性和紧凑设计，DSSAS频率稳定对于量子传感器应用，如原子磁力计、原子陀螺仪和原子钟，具有广阔前景。
