中国物理B ›› 2008, Vol. 17 ›› Issue (9): 3358-3362.doi: 10.1088/1674-1056/17/9/035

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

The dispersive properties of an excited-doubletfour-level atomic system

胡正峰, 邓见辽, 王育竹   

  1. The Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 收稿日期:2007-11-07 修回日期:2008-03-24 出版日期:2008-09-08 发布日期:2008-09-08
  • 基金资助:
    Project supported by the Knowledge Innovation Program (KIP) of the Chinese Academy of Sciences (Grant No KGCX3-SYW-405) and the National Fundamental Research Program of China (Grant Nos 2005CB724507 and 2006CB921202).

The dispersive properties of an excited-doubletfour-level atomic system

Hu Zheng-Feng(胡正峰)†, Deng Jian-Liao(邓见辽), and Wang Yu-Zhu(王育竹)   

  1. The Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2007-11-07 Revised:2008-03-24 Online:2008-09-08 Published:2008-09-08
  • Supported by:
    Project supported by the Knowledge Innovation Program (KIP) of the Chinese Academy of Sciences (Grant No KGCX3-SYW-405) and the National Fundamental Research Program of China (Grant Nos 2005CB724507 and 2006CB921202).

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摘要： We have investigated the dispersive properties of excited-doublet four-level atoms interacting with a weak probe field and an intense coupling laser field. We have derived an analytical expression of the dispersion relation for a general excited-doublet four-level atomic system subject to a one-photon detuning. The numerical results demonstrate that for a typical rubidium $\rm {D1}$ line configuration, due to the unequal dipole moments for the transitions of each ground state to double excited states, generally there exists no exact dark state in the system. Close to the two-photon resonance, the probe light can be absorbed or gained and propagate in the so-called superluminal form. This system may be used as an optical switch.

Abstract: We have investigated the dispersive properties of excited-doublet four-level atoms interacting with a weak probe field and an intense coupling laser field. We have derived an analytical expression of the dispersion relation for a general excited-doublet four-level atomic system subject to a one-photon detuning. The numerical results demonstrate that for a typical rubidium $\rm {D1}$ line configuration, due to the unequal dipole moments for the transitions of each ground state to double excited states, generally there exists no exact dark state in the system. Close to the two-photon resonance, the probe light can be absorbed or gained and propagate in the so-called superluminal form. This system may be used as an optical switch.

Key words: photon-atom interaction, susceptibility, quantum interference phenomena

中图分类号:  (Photoionization and excitation)

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