Improvement of the short-term stability of atomic fountain clock with state preparation by two-laser optical pumping

doi:10.1088/1674-1056/abe22a

中国物理B ›› 2021, Vol. 30 ›› Issue (5): 50602-050602.doi: 10.1088/1674-1056/abe22a

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

收稿日期:2020-12-21 修回日期:2021-01-11 接受日期:2021-02-02 出版日期:2021-05-14 发布日期:2021-05-14
通讯作者: Fang Fang, Tian-Chu Li E-mail:fangf@nim.ac.cn;litch@nim.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11873044).

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

Received:2020-12-21 Revised:2021-01-11 Accepted:2021-02-02 Online:2021-05-14 Published:2021-05-14
Contact: Fang Fang, Tian-Chu Li E-mail:fangf@nim.ac.cn;litch@nim.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11873044).

摘要/Abstract

摘要： 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.

关键词: optical pumping, atomic fountain clock, spin-polarization, short-term stability

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.

Key words: optical pumping, atomic fountain clock, spin-polarization, short-term stability

中图分类号: (Time and frequency)

06.30.Ft

31.15.-p (Calculations and mathematical techniques in atomic and molecular physics) 32.10.Fn (Fine and hyperfine structure) 32.80.Xx (Level crossing and optical pumping)

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[J]. 中国物理B, 2021, 30(5): 50602-050602.

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Improvement of the short-term stability of atomic fountain clock with state preparation by two-laser optical pumping

Improvement of the short-term stability of atomic fountain clock with state preparation by two-laser optical pumping

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