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Chin. Phys. B, 2022, Vol. 31(4): 043201    DOI: 10.1088/1674-1056/ac2d21

High-performance coherent population trapping clock based on laser-cooled atoms

Xiaochi Liu(刘小赤)1,†, Ning Ru(茹宁)1, Junyi Duan(段俊毅)1, Peter Yun(云恩学)2, Minghao Yao(姚明昊)1,3, and Jifeng Qu(屈继峰)1
1 Center for Advanced Measurement Science, National Institute of Metrology, Beijing 100029, China;
2 National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China;
3 College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Abstract  We present a coherent population trapping clock system based on laser-cooled $^{87}$Rb atoms. The clock consists of a frequency-stabilized CPT interrogation laser and a cooling laser as well as a compact magneto-optical trap, a high-performance microwave synthesizer, and a signal detection system. The resonance signal in the continuous wave regime exhibits an absorption contrast of $\sim 50$%. In the Ramsey interrogation method, the linewidth of the central fringe is 31.25 Hz. The system achieves fractional frequency stability of ${2.4\times }{{10}}^{{-11}}/\sqrt \tau $, which goes down to ${1.8\times }{{10}}^{{-13}}$ at 20000 s. The results validate that cold atom interrogation can improve the long-term frequency stability of coherent population trapping clocks and holds the potential for developing compact/miniature cold atoms clocks.
Keywords:  coherent population trapping      atomic clock      cold atoms      microwave synthesizer  
Received:  31 August 2021      Revised:  27 September 2021      Accepted manuscript online:  06 October 2021
PACS:  32.30.-r (Atomic spectra?)  
Fund: We are grateful to Lin Dan and Qiang Hao for their fruitful discussions. This work was supported by the National Natural Science Foundation of China (Grant No. 61975194).
Corresponding Authors:  Xiaochi Liu     E-mail:

Cite this article: 

Xiaochi Liu(刘小赤), Ning Ru(茹宁), Junyi Duan(段俊毅), Peter Yun(云恩学), Minghao Yao(姚明昊), and Jifeng Qu(屈继峰) High-performance coherent population trapping clock based on laser-cooled atoms 2022 Chin. Phys. B 31 043201

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