中国物理B ›› 2007, Vol. 16 ›› Issue (2): 441-448.doi: 10.1088/1009-1963/16/2/026

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Phase-dependent inversionless gain in a four-level atomic system with a closed interaction loop

吴金辉1, 高锦岳1, 徐卫华2   

  1. (1)College of Physics, Jilin University, Changchun 130023, China ;Key Laboratory for Coherent Light, Atomic and Molecular Spectroscopy of Ministry of Education, Jilin University, Changchun 130023, China ; (2)College of Physics, Shenzhen University, Shenzhen 518060, China
  • 收稿日期:2006-03-14 修回日期:2006-08-09 出版日期:2007-02-20 发布日期:2007-02-20
  • 基金资助:
    Project supported by the Natural Science Foundation of Guangdong Province (Grant No 05301018), the Research and Development Fund of Shenzhen University, China (Grant No 200549), and the National Natural Science Foundation of China (Grant Nos 10334010 and 10404009).

Phase-dependent inversionless gain in a four-level atomic system with a closed interaction loop

Xu Wei-Hua(徐卫华)a)†, Wu Jin-Hui(吴金辉)b)c), and Gao Jin-Yue(高锦岳)b)c)   

  1. a College of Physics, Shenzhen University, Shenzhen 518060, Chinab College of Physics, Jilin University, Changchun 130023, China; b Key Laboratory for Coherent Light, Atomic and Molecular Spectroscopy of Ministry of Education, Jilin University, Changchun 130023, China
  • Received:2006-03-14 Revised:2006-08-09 Online:2007-02-20 Published:2007-02-20
  • Supported by:
    Project supported by the Natural Science Foundation of Guangdong Province (Grant No 05301018), the Research and Development Fund of Shenzhen University, China (Grant No 200549), and the National Natural Science Foundation of China (Grant Nos 10334010 and 10404009).

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摘要： A four-level atomic system with a closed interaction loop connected by two coherent driving fields and a microwave field is investigated. The results show that inversionless gain can be achieved on a higher frequency transition outside the closed interaction loop, and the gain behaviour can be modulated by the phase of the closed loop as well as the amplitude of the microwave field. The phase sensitivity property in such a scheme is similar to that in an analogous configuration with spontaneously generated coherence, but it is beyond the rigorous condition of near-degenerate levels with non-orthogonal dipole moments. Therefore this scheme is much more convenient in experimental realization.

关键词: inversionless gain, microwave field, closed interaction loop, phase

Abstract: A four-level atomic system with a closed interaction loop connected by two coherent driving fields and a microwave field is investigated. The results show that inversionless gain can be achieved on a higher frequency transition outside the closed interaction loop, and the gain behaviour can be modulated by the phase of the closed loop as well as the amplitude of the microwave field. The phase sensitivity property in such a scheme is similar to that in an analogous configuration with spontaneously generated coherence, but it is beyond the rigorous condition of near-degenerate levels with non-orthogonal dipole moments. Therefore this scheme is much more convenient in experimental realization.

Key words: inversionless gain, microwave field, closed interaction loop, phase

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

  • 42.50.Gy
32.80.Qk (Coherent control of atomic interactions with photons) 42.50.Ct (Quantum description of interaction of light and matter; related experiments)