中国物理B ›› 2004, Vol. 13 ›› Issue (10): 1722-1727.doi: 10.1088/1009-1963/13/10/026

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Quantum interference effects on the probe amplification without and with inversion in a four-level system

徐卫华1, 张惠芳1, 高锦岳1, 张冰2   

  1. (1)College of Physics, Jilin University, Changchun 130023, China; Key Laboratory of Coherent Light, Atomic and Molecular Spectroscopy, Education Ministry of China, China; (2)College of Physics, Jilin University, Changchun 130023, China; Key Laboratory of Coherent Light, Atomic and Molecular Spectroscopy, Education Ministry of China, China; Department of Physics, Mudanjiang Teachers' College, Mudanjiang 157012, China
  • 收稿日期:2003-07-21 修回日期:2004-01-09 出版日期:2004-10-20 发布日期:2005-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10334010) and the Doctoral Program Foundation of Institution of Higher Education of China (Grant No 19201038).

Quantum interference effects on the probe amplification without and with inversion in a four-level system

Zhang Bing (张冰)abc, Xu Wei-Hua (徐卫华)ab, Zhang Hui-Fang (张惠芳)ab, Gao Jin-Yue (高锦岳)ab    

  1. a College of Physics, Jilin University, Changchun 130023, Chinab Key Laboratory of Coherent Light, Atomic and Molecular Spectroscopy, Education Ministry of China, China; b Department of Physics, Mudanjiang Teachers' College, Mudanjiang 157012, China
  • Received:2003-07-21 Revised:2004-01-09 Online:2004-10-20 Published:2005-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10334010) and the Doctoral Program Foundation of Institution of Higher Education of China (Grant No 19201038).

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摘要： A four-level system driven by two coherent fields is considered. It is shown that in the presence of an incoherent pump, the probe gain at a short wavelength can be achieved due to the quantum interference. Our density matrix calculation provides the conditions for probe amplification from different origins, including gain without population inversion on any state basis, gain with population inversion on the dressed-state basis, and gain with population inversion on the bare-state basis. Also, by controlling the Rabi frequency of the coupling field a total change from non-inversion to inversion can be achieved which does not depend on the intensity of the incoherent pump.

关键词: quantum interference, probe gain, inversion, non-inversion

Abstract: A four-level system driven by two coherent fields is considered. It is shown that in the presence of an incoherent pump, the probe gain at a short wavelength can be achieved due to the quantum interference. Our density matrix calculation provides the conditions for probe amplification from different origins, including gain without population inversion on any state basis, gain with population inversion on the dressed-state basis, and gain with population inversion on the bare-state basis. Also, by controlling the Rabi frequency of the coupling field a total change from non-inversion to inversion can be achieved which does not depend on the intensity of the incoherent pump.

Key words: quantum interference, probe gain, inversion, non-inversion

中图分类号: 

  • 42.50.Ar
32.80.Qk (Coherent control of atomic interactions with photons)