Spectrally selective optical pumping in Doppler-broadened cesium atoms

• Published in: Chinese physics B Vol. 22; no. 5; pp. 267 - 271
• Main Author: 张军海 曾宪金 李庆萌
• Format: Journal Article
• Language: English
• Published: 01.05.2013
• Subjects: Brackets; Cesium; Ground state; Magnetic fields; Mathematical analysis; Mathematical models; Optical pumping; Spectra; Zeeman effect; 光学Bloch方程; 光泵; 光谱选择性; 多普勒展宽; 纤维蛋白原; 超精细能级; 铯原子; 饱和强度
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/22/5/053202

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.