Influence of Doppler-broadening on absorption-dispersion properties in a resonant coherent medium  

作　　者：徐卫华 高锦岳 

机构地区：[1]Department of Physics, College of Science, Shenzhen University, Shenzhen 518060, China [2]Key Laboratory for Coherent Light, Atomic and Molecular Spectroscopy of Education Ministry, College of Physics, Jilin University, Changchun 130023, China

出　　处：《Chinese Physics B》2005年第12期2496-2502,共7页中国物理B（英文版）

摘　　要：We investigate the influence of Doppler broadening on absorption-dispersion properties in a four-level atomic system that can evolve from a normal dispersion to an anomalous dispersion. Our results show that the absorption-dispersion properties become strongly dependent on the propagation directions of the applied fields if Doppler broadening is taken into account. Especially, the switchover in the sign of the dispersion is still achievable even in the presence of Doppler broadening if properly arranging the propagation directions of the applied fields, which is in contrast with the otherwise behaviours in some other configurations.We investigate the influence of Doppler broadening on absorption-dispersion properties in a four-level atomic system that can evolve from a normal dispersion to an anomalous dispersion. Our results show that the absorption-dispersion properties become strongly dependent on the propagation directions of the applied fields if Doppler broadening is taken into account. Especially, the switchover in the sign of the dispersion is still achievable even in the presence of Doppler broadening if properly arranging the propagation directions of the applied fields, which is in contrast with the otherwise behaviours in some other configurations.

关 键 词：Doppler broadening ABSORPTION dispersion SUBLUMINAL SUPERLUMINAL 

分 类 号：O562[理学—原子与分子物理]