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

作　　者：孙晓林 张建伟 程鹏飞 左娅妮 王力军 

机构地区：[1]State Key Laboratory of Precision Measurement Technology and Instruments,Tsinghua University [2]Department of Physics, Tsinghua University [3]Department of Precision Instruments, Tsinghua University

出　　处：《Chinese Physics B》2018年第2期280-284,共5页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2016YFA0302101);the Initiative Program of State Key Laboratory of Precision Measurement Technology and Instruments

摘　　要：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.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.

关 键 词：coherent population trapping Dick effect atomic clock 

分 类 号：TM935.115[电气工程—电力电子与电力传动]