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

doi:10.1088/1674-1056/ac2d21

中国物理B ›› 2022, Vol. 31 ›› Issue (4): 43201-043201.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

收稿日期:2021-08-31 修回日期:2021-09-27 接受日期:2021-10-06 出版日期:2022-03-16 发布日期:2022-03-16
通讯作者: Xiaochi Liu E-mail:liuxch@nim.ac.cn
基金资助:
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).

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

Received:2021-08-31 Revised:2021-09-27 Accepted:2021-10-06 Online:2022-03-16 Published:2022-03-16
Contact: Xiaochi Liu E-mail:liuxch@nim.ac.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: coherent population trapping, atomic clock, cold atoms, microwave synthesizer

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.

Key words: coherent population trapping, atomic clock, cold atoms, microwave synthesizer

中图分类号: (Atomic spectra?)

32.30.-r

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[J]. 中国物理B, 2022, 31(4): 43201-043201.

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

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

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