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| The Research on Synchronously Stimulated Coherent Population Beating Atomic Clock |
| ZHUANG Yu-xin,ZHAO Xiao-na,WANG Zhong |
| Peking University, Beijing 100871,China |
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Abstract The atomic clock based on coherent population beating (CPB) phenomenon can directly obtain the frequency difference and its shift of an atom transition frequency and a microwave frequency. In order to solve the problem of signal amplitude decay in asynchronous CPB scheme, the scheme of synchronously stimulated CPB atomic clock is proposed. By synchronously applying two coherent population trapping (CPT) resonant stimulating lights and two detuned detecting lights to an atomic cell, the coherence of atomic ground states can be maintained, and the CPB signal will not decay. The continuous CPB signal is beneficial for the accuracy of and the stability of atomic clock. The table experimental system of the synchronously stimulated CPB clock had achieved the stability of 7.7×10-11 at 1 second, 9.6×10-13 at 1000 second.
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［1］仲崇霞, 姜东伟, 杨军. 地面铷原子钟稳定性和一致性研究［J］. 计量学报, 2011, 32(1): 75-79.
［2］徐建, 石雄, 甘志银, 等. 被动型CPT原子钟光源系统的设计与实现［J］. 仪器仪表学报, 2011, 32(12): 2814-2820.
［3］Alzetta G, Gozzini A, Moi M, et al. An experimental method for the observation of rf transitions and laser beat resonances in oriented Na vapour［J］. Il Nuovo Cimento B, 1976, 36(1):5-20.
［4］Wang Z. Review of chip-scale atomic clocks based on coherent population trapping［J］. Chinese Physics B. 2014, 23(3):030601.
［5］Vanier J. Atomic clocks based on coherent population trapping: a review［J］. Applied Physics B. 2005, 81(4):421-442.
［6］Park S J, Cho H. Transient coherence oscillation induced by a detuned Raman field in a rubidium Λ system［J］. Physical Review A. 2004, 69(2):023806.
［7］F. Meinert, C. Basler, A. Lambrecht, et al. Quantitative analysis of the transient response of the refractive index to conditions of electromagnetically induced transparency［J］. Physics Review A. 2012, 85(1): 013820.
［8］Guo T, Deng K, Chen X Z, et al. Atomic clock based on transient coherent population trapping［J］. Applied Physics Letters. 2009, 94(15):151108.
［9］Shi D T, Li Y Q, Wang Z. An Accurate Measuring Method for the Transient Oscillation Frequency of Detuned Coherent Population Trapping Atomic Clock［C］. //European Frequency and Time Forum & International Frequency Control Symposium (EFTF/IFCS), Prague, Czech, 2013, 758
-761.
［10］Li D W, Shi D T, Hu E M, et al. A Frequency Standard via Spectrum Analysis and Direct Digital Synthesis［J］. Applied Physics Express. 2014, 7(11):112203. |
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2015, Vol. 36 
