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Investigation of experimental parameters of coherent population trapping with cesium vapor cell

Liu Zhi Diao Wen-Ting Wang Jie-Ying Liang Qiang-Bing Yang Bao-Dong He Jun Zhang Tian-Cai Wang Jun-Min

Investigation of experimental parameters of coherent population trapping with cesium vapor cell

Liu Zhi, Diao Wen-Ting, Wang Jie-Ying, Liang Qiang-Bing, Yang Bao-Dong, He Jun, Zhang Tian-Cai, Wang Jun-Min
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  • Received Date:  13 March 2012
  • Accepted Date:  26 June 2012
  • Published Online:  05 December 2012

Investigation of experimental parameters of coherent population trapping with cesium vapor cell

  • 1. State Key Laboratory of Quantum Optics and Quantum Optics Devices (Shanxi University) and Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant Nos. 60978017, 61078051, 11104172), the Project for Excellent Research Team of the National Natural Science Foundation of China (Grant No. 61121064), the National Basic Research Program of China (Grant No. 2012CB921601), and the Research Project for Returned Abroad Scholars from Universities of Shanxi Province, China and the Research Training Project for University Students from the National Natural Science Foundation of China (Grant No. J1103210).

Abstract: According to the Λ -type three-level system consisting of cesium 6S1/2 (F=3 and F=4) long-lived ground states and 6P3/2 (F'=4) excited state, we experimentally investigate and theoretically analyze the parameters of coherent population trapping (CPT) spectra in a cesium atomic vapor cell with or without neon as buffer gas. The CPT of the full width at half maximum (FWHM), the signal amplitude as a function of optical intensity of the two phased-locked laser beams with a frequency difference of 9.19263177 GHz (the hyperfine splitting in the cesium ground state 6S1/2), relative intensity ratio, beam spot size, residual magnetic field of the magnetic shielding, and the influence of with and without the cesium vapor cell containing neon as buffer gas are investigated experimentally. With the optimized parameters, we obtain the CPT signal FWHM to be as narrow as ~ 340 Hz.

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