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Frequency Stability of Atomic Clocks Based on Coherent Population Trapping Resonance in 85Rb |
| LIU Lu;GUO Tao;DENG Ke;LIU Xin-Yuan;CHEN Xu-Zong;WANG Zhong |
| Laboratory for Quantum Information and Measurements, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871 |
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| Cite this article: |
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LIU Lu, GUO Tao, DENG Ke et al 2007 Chin. Phys. Lett. 24 1883-1885 |
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Abstract An atomic clock system based on coherent population trapping (CPT) resonance in 85Rb is reported, while most past works about the CPT clock are in 87Rb. A new modulation method (full-hyperfine-frequency-splitting modulation) is presented to reduce the effect of light shift to improve the frequency stability of the CPT clock in 85Rb. The experimental results show that the short-term frequency stability of the CPT clock in 85Rb is in the order of 10-10/s and the long-term frequency stability can achieve 1.5×10-11/80000s, which performs as well as 87Rb in CPT resonance. This very good frequency stability performance associated with the low-cost and low-power properties of 85Rb indicates that an atomic clock based on CPT in 85Rb should be a promising candidate for making the chip scale atomic clock.
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| Keywords:
32.30.Bv
32.70.Jz
42.50.Gy
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Received: 28 February 2007
Published: 25 June 2007
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| PACS: |
32.30.Bv
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(Radio-frequency, microwave, and infrared spectra)
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32.70.Jz
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(Line shapes, widths, and shifts)
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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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