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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 |
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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 $\vert F=4, m_{F}=0\rangle$ clock state with a shortened cycle time. Two $\pi $-polarized laser beams overlapped in the horizontal plane have been applied after launching, one is resonant with $\vert F=4\rangle \to \vert F'=4\rangle$ transition and the other is resonant with $\vert F=3\rangle \to \vert F'=4\rangle$ transition. With optical pumping, the population accumulated in the $\vert m_{F}=0\rangle$ 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.
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Received: 21 December 2020
Revised: 11 January 2021
Accepted manuscript online: 02 February 2021
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PACS:
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06.30.Ft
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(Time and frequency)
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31.15.-p
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(Calculations and mathematical techniques in atomic and molecular physics)
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32.10.Fn
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(Fine and hyperfine structure)
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32.80.Xx
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(Level crossing and optical pumping)
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| 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
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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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