| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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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 |
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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.
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Received: 31 May 2021
Revised: 01 July 2021
Accepted manuscript online: 07 July 2021
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PACS:
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42.62.Fi
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(Laser spectroscopy)
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95.55.Sh
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(Auxiliary and recording instruments; clocks and frequency standards)
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42.62.Eh
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(Metrological applications; optical frequency synthesizers for precision spectroscopy)
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42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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| Fund: 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). |
Corresponding Authors:
Hong Chang
E-mail: changhong@ntsc.ac.cn
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Cite this article:
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 2022 Chin. Phys. B 31 034209
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