中国物理B ›› 2003, Vol. 12 ›› Issue (1): 39-44.doi: 10.1088/1009-1963/12/1/307

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The probe gain with and without inversion in a four-level atomic model: light amplification at a short wavelength

吴金辉, 王登攀, 张惠芳, 肖志宏, 高锦岳   

  1. College of Physics, Jilin University, Changchun 130023, China
  • 收稿日期:2002-07-17 修回日期:2002-09-18 出版日期:2003-01-20 发布日期:2003-01-20
  • 基金资助:
    Project supported in part by the National Natural Science Foundation of China (Grant No 60078015), and the Doctoral Program Foundation of Institution of Higher Education of China (Grant No 19201038)

The probe gain with and without inversion in a four-level atomic model: light amplification at a short wavelength

Wu Jin-Hui (吴金辉)a, Wang Deng-Pan (王登攀)a, Zhang Hui-Fang (张惠芳)a, Xiao Zhi-Hong (肖志宏)a, Gao Jin-Yue (高锦岳)ab   

  1. a College of Physics, Jilin University, Changchun 130023, China; b Chinese Center of Advanced Science and Technology (World Laboratory), Beijing 100080, China
  • Received:2002-07-17 Revised:2002-09-18 Online:2003-01-20 Published:2003-01-20
  • Supported by:
    Project supported in part by the National Natural Science Foundation of China (Grant No 60078015), and the Doctoral Program Foundation of Institution of Higher Education of China (Grant No 19201038)

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摘要： We propose a new four-level atomic model for achieving light amplification at a short wavelength, where direct incoherent pumping into the top level is avoided by the advantage of coherent pumping. In this model, the lower level of the probe transition is an excited state but not the usual ground state. By analytical as well as numerical calculations, we find that the probe gain, either with or without population inversion, which depends on the relation between spontaneous decay rates $\g_{42}$ and $\g_{21}$, can be achieved with proper parameters. We note that the Raman scattering gain always plays an important role in achieving the probe amplification.

Abstract: We propose a new four-level atomic model for achieving light amplification at a short wavelength, where direct incoherent pumping into the top level is avoided by the advantage of coherent pumping. In this model, the lower level of the probe transition is an excited state but not the usual ground state. By analytical as well as numerical calculations, we find that the probe gain, either with or without population inversion, which depends on the relation between spontaneous decay rates $\gamma_{42}$ and $\gamma_{21}$, can be achieved with proper parameters. We note that the Raman scattering gain always plays an important role in achieving the probe amplification.

Key words: probe gain with or without inversion, atomic coherence, Raman scattering gain

中图分类号:  (Level crossing and optical pumping)

  • 32.80.Xx
42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption) 32.30.-r (Atomic spectra?)