中国物理B ›› 2005, Vol. 14 ›› Issue (12): 2496-2502.doi: 10.1088/1009-1963/14/12/021

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

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

徐卫华1, 高锦岳2   

  1. (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
  • 收稿日期:2005-05-11 修回日期:2005-06-16 出版日期:2005-12-20 发布日期:2005-12-20
  • 基金资助:
    Project supported by the SZU R/D Fund (Grant No 200549).

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

Xu Wei-Hua (徐卫华)a, Gao Jin-Yue (高锦岳)b   

  1. a Department of Physics, College of Science, Shenzhen University,Shenzhen 518060, China; b Key Laboratory for Coherent Light, Atomic and Molecular Spectroscopy of Education Ministry, College of Physics, Jilin University, Changchun 130023, China
  • Received:2005-05-11 Revised:2005-06-16 Online:2005-12-20 Published:2005-12-20
  • Supported by:
    Project supported by the SZU R/D Fund (Grant No 200549).

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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.

Abstract: 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.

Key words: Doppler broadening, absorption, dispersion, subluminal, superluminal

中图分类号:  (Line shapes, widths, and shifts)

  • 32.70.Jz
42.25.Bs (Wave propagation, transmission and absorption) 42.50.Nn (Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems)