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Chin. Phys. B, 2021, Vol. 30(8): 080602    DOI: 10.1088/1674-1056/ac0698
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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
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, mF=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.
Keywords:  optical pumping      atomic fountain clock      spin polarization      optical state selection  
Received:  20 February 2021      Revised:  08 April 2021      Accepted manuscript online:  29 May 2021
PACS:  06.30.Ft (Time and frequency)  
  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)  
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), 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 2021 Chin. Phys. B 30 080602

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