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An Accurate Frequency Control Method and Atomic Clock Based on Coherent Population Beating Phenomenon |
| Yu-Xin Zhuang, Dai-Ting Shi, Da-Wei Li, Yi-Gen Wang, Xiao-Na Zhao, Jian-Ye Zhao, Zhong Wang** |
School of Electronics Engineering and Computer Science, Peking University, Beijing 100871
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| Cite this article: |
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Yu-Xin Zhuang, Dai-Ting Shi, Da-Wei Li et al 2016 Chin. Phys. Lett. 33 040601 |
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Abstract An accurate frequency control method and atomic clock based on the coherent population beating (CPB) phenomenon is implemented. In this scheme, the frequency difference of an rf and an atomic transition frequency can be digitally obtained by measuring the CPB oscillation frequency. The frequency measurement resolution of several milli-hertz can be achieved by using a 10 MHz oven controlled crystal oscillator as the reference. The expression of the Allan deviation of the CPB clock is theoretically deduced and it is revealed that the Allan deviation is inversely proportional to the signal-to-noise ratio and proportional to the line-width of coherent population trapping spectrum. We also approve that the CPB atomic clock has a large toleration of the drift of the local oscillator. In our CPB experimental system, a frequency instability of $3.0\times10^{-12}$ at 1000 s is observed. The important feature of high frequency measurement resolution of the CPB method may also be used in magnetometers, atomic spectroscopy, and other related research.
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Received: 30 November 2015
Published: 29 April 2016
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| PACS: |
06.30.Ft
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(Time and frequency)
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95.55.Sh
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(Auxiliary and recording instruments; clocks and frequency standards)
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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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