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Chin. Phys. B, 2017, Vol. 26(6): 064203    DOI: 10.1088/1674-1056/26/6/064203

Investigation of the nonlinear CPT spectrum of 87Rb and its application for large dynamic magnetic measurement

Chi Xu(徐迟)1,2, Shi-Guang Wang(王时光)2,3, Yong Hu(胡勇)2,3, Yan-Ying Feng(冯焱颖)2,3, Li-Jun Wang(王力军)1,2,3
1 Department of Physics, Tsinghua University, Beijing 100084, China;
2 Joint Institute for Measurement Science, Tsinghua University, Beijing 100084, China;
3 State Key Laboratory of Precision Measurement Technology and Instrument, Tsinghua University, Beijing 100084, China

The coherent population trapping (CPT) phenomenon has found widespread application in quantum precision measurements. Various designs based on the narrow resonant spectrum corresponding to the linear Zeeman effect have been demonstrated to achieve high performance. In this article, the nonlinear Zeeman split of the CPT spectrum of 87Rb in the lin||lin setup is investigated. We observe re-split phenomenon for both magnetic sensitive and magnetic insensitive CPT resonant lines at a large magnetic field. The re-split in the magnetic sensitive lines raises a practical problem to magnetometers worked in the lin||lin setup while the other one shows a good potential for applications in large magnetic field. We propose a design based on the nonlinear split of the magnetic insensitive lines and test its performance. It provides a much larger measurement range compared to the linear one, offering an option for atomic magnetometers where a large dynamic range is preferred.

Keywords:  coherent population trapping      nonlinear Zeeman effect      large dynamic magnetometer  
Received:  27 December 2016      Revised:  13 February 2017      Accepted manuscript online: 
PACS:  42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)  
  32.60.+i (Zeeman and Stark effects)  
  07.55.Ge (Magnetometers for magnetic field measurements)  

Project supported by the National Natural Science Foundation of China (Grant No. 61473166) and China Postdoctoral Science Foundation (Grant No. 014M560958).

Corresponding Authors:  Yan-Ying Feng, Li-Jun Wang     E-mail:;

Cite this article: 

Chi Xu(徐迟), Shi-Guang Wang(王时光), Yong Hu(胡勇), Yan-Ying Feng(冯焱颖), Li-Jun Wang(王力军) Investigation of the nonlinear CPT spectrum of 87Rb and its application for large dynamic magnetic measurement 2017 Chin. Phys. B 26 064203

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