Interrogation of optical Ramsey spectrum and stability study of an 87Sr optical lattice clock

doi:10.1088/1674-1056/ac11e0

中国物理B ›› 2022, Vol. 31 ›› Issue (3): 34209-034209.doi: 10.1088/1674-1056/ac11e0

Interrogation of optical Ramsey spectrum and stability study of an ⁸⁷Sr optical lattice clock

Jing-Jing Xia(夏京京)¹, Xiao-Tong Lu(卢晓同)^1,2, and Hong Chang(常宏)^1,2,†

1 CAS Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Xi'an 710600, China;
2 University of Chinese Academy of Sciences(CAS), Beijing 100049, China

收稿日期:2021-05-31 修回日期:2021-07-01 接受日期:2021-07-07 出版日期:2022-02-22 发布日期:2022-02-14
通讯作者: Hong Chang E-mail:changhong@ntsc.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 61775220), the Key Research Project of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-JSC004), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100).

Interrogation of optical Ramsey spectrum and stability study of an ⁸⁷Sr optical lattice clock

Jing-Jing Xia(夏京京)¹, Xiao-Tong Lu(卢晓同)^1,2, and Hong Chang(常宏)^1,2,†

1 CAS Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Xi'an 710600, China;
2 University of Chinese Academy of Sciences(CAS), Beijing 100049, China

Received:2021-05-31 Revised:2021-07-01 Accepted:2021-07-07 Online:2022-02-22 Published:2022-02-14
Contact: Hong Chang E-mail:changhong@ntsc.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 61775220), the Key Research Project of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-JSC004), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100).

摘要/Abstract

摘要： The optical Ramsey spectrum is experimentally realized in an ⁸⁷Sr optical lattice clock, and the measured linewidth agrees well with theoretical expectation. The coherence time between the clock laser and the atoms, which indicates the maximum free evolution period of using Ramsey detection to measure the atom-laser phase information, is determined as 340(23) ms by measuring the fringe contrasts of the Ramsey spectrum as a function of the free evolution period. Furthermore, with the same clock duty cycle of about 0.1, the clock stability is measured by using the Ramsey and Rabi spectra, respectively. The experimental and theoretical results show approximately the same stability as the two detection methods, which indicates that Ramsey detection cannot obviously improve the clock stability until the clock duty cycle is large enough. Thus, it is of great significance to choose the detection method of a specific clock.

关键词: optical Ramsey spectrum, optical lattice clock, stability, coherence time

Abstract: The optical Ramsey spectrum is experimentally realized in an ⁸⁷Sr optical lattice clock, and the measured linewidth agrees well with theoretical expectation. The coherence time between the clock laser and the atoms, which indicates the maximum free evolution period of using Ramsey detection to measure the atom-laser phase information, is determined as 340(23) ms by measuring the fringe contrasts of the Ramsey spectrum as a function of the free evolution period. Furthermore, with the same clock duty cycle of about 0.1, the clock stability is measured by using the Ramsey and Rabi spectra, respectively. The experimental and theoretical results show approximately the same stability as the two detection methods, which indicates that Ramsey detection cannot obviously improve the clock stability until the clock duty cycle is large enough. Thus, it is of great significance to choose the detection method of a specific clock.

Key words: optical Ramsey spectrum, optical lattice clock, stability, coherence time

中图分类号: (Laser spectroscopy)

42.62.Fi

95.55.Sh (Auxiliary and recording instruments; clocks and frequency standards) 42.62.Eh (Metrological applications; optical frequency synthesizers for precision spectroscopy) 42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)

Jing-Jing Xia(夏京京), Xiao-Tong Lu(卢晓同), and Hong Chang(常宏). Interrogation of optical Ramsey spectrum and stability study of an ⁸⁷Sr optical lattice clock[J]. 中国物理B, 2022, 31(3): 34209-034209.

Jing-Jing Xia(夏京京), Xiao-Tong Lu(卢晓同), and Hong Chang(常宏). Interrogation of optical Ramsey spectrum and stability study of an ⁸⁷Sr optical lattice clock[J]. Chin. Phys. B, 2022, 31(3): 34209-034209.

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Interrogation of optical Ramsey spectrum and stability study of an ⁸⁷Sr optical lattice clock

Interrogation of optical Ramsey spectrum and stability study of an ⁸⁷Sr optical lattice clock

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