中国物理B ›› 2007, Vol. 16 ›› Issue (1): 130-136.doi: 10.1088/1009-1963/16/1/023

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Stimulated emission and multi-peaked absorption in a four level N-type atom

王凯, 古英, 龚旗煌   

  1. State Key Laboratory for Mesoscopic Physics, Department of Physics,Peking University, Beijing 100871, China
  • 收稿日期:2006-03-23 修回日期:2006-08-03 出版日期:2007-02-01 发布日期:2007-02-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10334010 10304001, 10521002, 10434020, 10328407 and 90501007).

Stimulated emission and multi-peaked absorption in a four level N-type atom

Wang Kai(王凯), Gu Ying (古英)†, and Gong Qi-Huang(龚旗煌)‡   

  1. State Key Laboratory for Mesoscopic Physics, Department of Physics,Peking University, Beijing 100871, China
  • Received:2006-03-23 Revised:2006-08-03 Online:2007-02-01 Published:2007-02-01
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10334010 10304001, 10521002, 10434020, 10328407 and 90501007).

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摘要： Absorption and refraction of the inner transition F2\leftrightarrow F3 of the closed four level N-type atom have been investigated under a weak field. The outer transitions F1\leftrightarrow F3 and F2\leftrightarrow F4 are resonantly interacted with drive field with frequency \omegac and Rabi frequency \Omegac, and saturation field with \Omegas and \Omegas, respectively. For the suitable Rabi frequencies \Omegac and \Omegas, we obtain the Mollow absorption spectrum of probe field. The reason is that the drive field excites the atom to the upper level Fc and simultaneously the saturation field takes the atom out of the lower level F2, leading to the stimulated emission. Meanwhile, due to the dynamic energy splitting induced by the drive and saturation fields, the two- and four-peaked absorption spectra are observed. At the zero off-resonance detuning of probe field, we also find the transfer of dispersion from negative to positive with an increment of \Omegas. Finally, the refractive index enhancement is predicted for a wide spectral region.

关键词: stimulated emission, multi-peaked absorption

Abstract: Absorption and refraction of the inner transition F2$\leftrightarrow$ F3 of the closed four level N-type atom have been investigated under a weak field. The outer transitions F1 $\leftrightarrow$ F3 and F2 $\leftrightarrow$ F4 are resonantly interacted with drive field with frequency $\omega$c and Rabi frequency $\varOmega$c, and saturation field with $\omega$s and $\varOmega$s, respectively. For the suitable Rabi frequencies $\varOmega$c and $\varOmega$s, we obtain the Mollow absorption spectrum of probe field. The reason is that the drive field excites the atom to the upper level F3 and simultaneously the saturation field takes the atom out of the lower level F2, leading to the stimulated emission. Meanwhile, due to the dynamic energy splitting induced by the drive and saturation fields, the two- and four-peaked absorption spectra are observed. At the zero off-resonance detuning of probe field, we also find the transfer of dispersion from negative to positive with an increment of $\varOmega$s. Finally, the refractive index enhancement is predicted for a wide spectral region.

Key words: stimulated emission, multi-peaked absorption

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

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