Optical state selection process with optical pumping in a cesium atomic fountain clock

doi:10.1088/1674-1056/ac0698

中国物理B ›› 2021, Vol. 30 ›› Issue (8): 80602-080602.doi: 10.1088/1674-1056/ac0698

Optical state selection process with optical pumping in a cesium atomic fountain clock

Lei Han(韩蕾)¹, Fang Fang(房芳)^2,†, Wei-Liang Chen(陈伟亮)², Kun Liu(刘昆)², Ya-Ni Zuo(左娅妮)², Fa-Song Zheng(郑发松)², Shao-Yang Dai(戴少阳)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:2021-02-20 修回日期:2021-04-08 接受日期:2021-05-29 出版日期:2021-07-16 发布日期:2021-08-13
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).

Optical state selection process with optical pumping in a cesium atomic fountain clock

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:2021-02-20 Revised:2021-04-08 Accepted:2021-05-29 Online:2021-07-16 Published:2021-08-13
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： We propose and realize a new optical state selection method on a cesium atomic fountain clock by applying a two-laser 3-3' optical pumping configuration to spin polarize atoms. The atoms are prepared in |F=3, m_F=0> clock state with optical pumping directly after being launched up, followed by a pushing beam to push away the atoms remaining in the |F=4> state. With a state selection efficiency exceeding 92%, this optical method can substitute the traditional microwave state selection, and helps to develop a more compact physical package. A Ramsey fringe has been achieved with this optical state selection method, and a contrast of 90% is obtained with a full width half maximum of 0.92 Hz. The short-term frequency stability of 6.8×10^-14 (τ/s)^-1/2 is acquired. In addition, the number of detected atoms is increased by a factor of 1.7 with the optical state selection.

关键词: optical pumping, atomic fountain clock, spin polarization, optical state selection

Abstract: We propose and realize a new optical state selection method on a cesium atomic fountain clock by applying a two-laser 3-3' optical pumping configuration to spin polarize atoms. The atoms are prepared in |F=3, m_F=0> clock state with optical pumping directly after being launched up, followed by a pushing beam to push away the atoms remaining in the |F=4> state. With a state selection efficiency exceeding 92%, this optical method can substitute the traditional microwave state selection, and helps to develop a more compact physical package. A Ramsey fringe has been achieved with this optical state selection method, and a contrast of 90% is obtained with a full width half maximum of 0.92 Hz. The short-term frequency stability of 6.8×10^-14 (τ/s)^-1/2 is acquired. In addition, the number of detected atoms is increased by a factor of 1.7 with the optical state selection.

Key words: optical pumping, atomic fountain clock, spin polarization, optical state selection

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), Ya-Ni Zuo(左娅妮), Fa-Song Zheng(郑发松), Shao-Yang Dai(戴少阳), and Tian-Chu Li(李天初). Optical state selection process with optical pumping in a cesium atomic fountain clock[J]. 中国物理B, 2021, 30(8): 80602-080602.

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Optical state selection process with optical pumping in a cesium atomic fountain clock

Optical state selection process with optical pumping in a cesium atomic fountain clock

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