Improvement of the short-term stability of atomic fountain clock with state preparation by two-laser optical pumping
Lei Han(韩蕾)1, Fang Fang(房芳)2,†, Wei-Liang Chen(陈伟亮)2, Kun Liu(刘昆)2, Shao-Yang Dai(戴少阳)2, Ya-Ni Zuo(左娅妮)2, and Tian-Chu Li(李天初)1,2,‡
1 School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China; 2 Key Laboratory of Time and Frequency Standards, National Institute of Metrology(NIM), Beijing 100029, China
Abstract To improve the signal to noise ratio (SNR) and the short-term stability of cesium atomic fountain clocks, the work of two-laser optical pumping is presented theoretically and experimentally. The short-term stability of the NIM6 fountain clock has been improved by preparing more cold atoms in the clock state with a shortened cycle time. Two -polarized laser beams overlapped in the horizontal plane have been applied after launching, one is resonant with transition and the other is resonant with transition. With optical pumping, the population accumulated in the clock state is improved from 11% to 63%, and the detection signal is increased by a factor of 4.2, the SNR of the clock transition probability and the short-term stability are also improved accordingly.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11873044).
Corresponding Authors:
Fang Fang, Tian-Chu Li
E-mail: fangf@nim.ac.cn;litch@nim.ac.cn
Cite this article:
Lei Han(韩蕾), Fang Fang(房芳), Wei-Liang Chen(陈伟亮), Kun Liu(刘昆), Shao-Yang Dai(戴少阳), Ya-Ni Zuo(左娅妮), and Tian-Chu Li(李天初) Improvement of the short-term stability of atomic fountain clock with state preparation by two-laser optical pumping 2021 Chin. Phys. B 30 050602
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