中国物理B ›› 2004, Vol. 13 ›› Issue (5): 692-699.doi: 10.1088/1009-1963/13/5/021

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Amplification mechanism and effects of spontaneously generated coherence on the probe gain in a four-level system

徐卫华, 吴金辉, 高锦岳   

  1. College of Physics, Jilin University, Changchun 130023, China
  • 收稿日期:2003-08-14 修回日期:2003-11-12 出版日期:2005-07-06 发布日期:2005-07-06
  • 基金资助:
    Project supported in part by the National Natural Science Foundation of China (Grant No 10334010).

Amplification mechanism and effects of spontaneously generated coherence on the probe gain in a four-level system

Xu Wei-Hua (徐卫华), Wu Jin-Hui (吴金辉), Gao Jin-Yue (高锦岳)   

  1. College of Physics, Jilin University, Changchun 130023, China
  • Received:2003-08-14 Revised:2003-11-12 Online:2005-07-06 Published:2005-07-06
  • Supported by:
    Project supported in part by the National Natural Science Foundation of China (Grant No 10334010).

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摘要： We investigate the amplification mechanism in a four-level system by both the density-matrix and quantum-jump approaches. We show that the asymmetry between three-photon stimulated emission and one-photon absorption process is responsible for the inversionless amplification of the probe field. We also investigate the effects of spontaneously generated coherence (SGC) on the probe gain, and find that due to the SGC, the probe gain can be greatly enhanced and can be modulated by changing the relative phase between the applied fields.

Abstract: We investigate the amplification mechanism in a four-level system by both the density-matrix and quantum-jump approaches. We show that the asymmetry between three-photon stimulated emission and one-photon absorption process is responsible for the inversionless amplification of the probe field. We also investigate the effects of spontaneously generated coherence (SGC) on the probe gain, and find that due to the SGC, the probe gain can be greatly enhanced and can be modulated by changing the relative phase between the applied fields.

Key words: quantum-jump, spontaneously generated coherence

中图分类号:  (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)

  • 42.50.Gy
42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)