Spectrally selective optical pumping in Doppler-broadened cesium atoms

作     者：张军海 曾宪金 李庆萌 黄强 孙伟民 

作者机构：Science SchoolHarbin Engineering University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2013年第22卷第5期

页      面：267-271页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

基　　金：Project supported by the International Cooperation Project of the Ministry of Science and Technology of China (Grant No. 2008DFR20420) the Fundamental Research Funds for the Central Universities, China (Grant No. HEUCF20111111) 

主　　题：spectrally selective pumping hyperfine structure population 

摘      要：The D1 line spectrally selective pumping process in Doppler-broadened cesium is analyzed by solving the optical Bloch equations. The process, described by a three-level model with the A scheme, shows that the saturation intensity of broadened atoms is three orders of magnitude larger than that of resting atoms. The 丨Fg = 3） →丨Fe = 4） resonance pumping can result in the ground state丨Fg = 4, mF = 4） sublevel having a maximum population of 0.157 and the population difference would be about 0.01 in two adjacent magnetic sublevels of the hyperfine （HF） state Fg = 4. To enhance the anisotropy in the ground state, we suggest employing dichromatic optical HF pumping by adding a laser to excite D1 line 丨Fg = 4） → 丨Fe = 3） transition, in which the cesium magnetometer sensitivity increases by half a magnitude and is unaffected by the nonlinear Zeeman effect even in Earth＇s average magnetic field.