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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 |
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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.
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Received: 31 August 2021
Revised: 27 September 2021
Accepted manuscript online: 06 October 2021
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PACS:
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32.30.-r
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(Atomic spectra?)
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| 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: liuxch@nim.ac.cn
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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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