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Chin. Phys., 2004, Vol. 13(5): 692-699    DOI: 10.1088/1009-1963/13/5/021
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Amplification mechanism and effects of spontaneously generated coherence on the probe gain in a four-level system

Xu Wei-Hua, Wu Jin-Hui, Gao Jin-Yue
College of Physics, Jilin University, Changchun 130023, China
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.
Keywords:  spontaneously generated coherence      quantum-jump  
Received:  14 August 2003      Revised:  12 November 2003      Published:  06 July 2005
PACS:  42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)  
  42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)  
Fund: Project supported in part by the National Natural Science Foundation of China (Grant No 10334010).

Cite this article: 

Xu Wei-Hua, Wu Jin-Hui, Gao Jin-Yue Amplification mechanism and effects of spontaneously generated coherence on the probe gain in a four-level system 2004 Chin. Phys. 13 692

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