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Chin. Phys. B, 2018, Vol. 27(2): 023101    DOI: 10.1088/1674-1056/27/2/023101

Theoretical analysis of suppressing Dick effect in Ramsey-CPT atomic clock by interleaving lock

Xiao-Lin Sun(孙晓林)1,2, Jian-Wei Zhang(张建伟)1,3, Peng-Fei Cheng(程鹏飞)1,2, Ya-Ni Zuo(左娅妮)1,2, Li-Jun Wang(王力军)1,2,3
1. State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China;
2. Department of Physics, Tsinghua University, Beijing 100084, China;
3. Department of Precision Instruments, Tsinghua University, Beijing 100084, China
Abstract  For most pulsed atomic clocks, the Dick effect is one of the main limits to reach its frequency stability limitation due to quantum projection noise. In this paper, we measure the phase noise of the local oscillator in the Ramsey-CPT atomic clock and calculate the Dick effect induced Allan deviation based on a three-level atomic model, which is quite different from typical atomic clocks. We further present a detailed analysis of optimizing the sensitivity function and minimizing the Dick effect by interleaving lock. By optimizing the duty circle of laser pulses, average time during detection and optical intensity of laser beam, the Dick effect induced Allan deviation can be reduced to the level of 10-14.
Keywords:  coherent population trapping      Dick effect      atomic clock  
Received:  29 August 2017      Revised:  14 November 2017      Accepted manuscript online: 
PACS:  31.15.-p (Calculations and mathematical techniques in atomic and molecular physics)  
  42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)  
  95.55.Sh (Auxiliary and recording instruments; clocks and frequency standards)  
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0302101) and the Initiative Program of State Key Laboratory of Precision Measurement Technology and Instruments.
Corresponding Authors:  Jian-Wei Zhang     E-mail:
About author:  31.15.-p; 42.50.Gy; 95.55.Sh

Cite this article: 

Xiao-Lin Sun(孙晓林), Jian-Wei Zhang(张建伟), Peng-Fei Cheng(程鹏飞), Ya-Ni Zuo(左娅妮), Li-Jun Wang(王力军) Theoretical analysis of suppressing Dick effect in Ramsey-CPT atomic clock by interleaving lock 2018 Chin. Phys. B 27 023101

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