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A simple three-level resonant model of lasing without inversion

机译：无反激激的简单三能级共振模型

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Recently more attention has been paid to the study of lasing without population inversion. It has been found that many schemes, with the help of optical coherence or quantum interference effect, may establish such optical phenomenon as that in refs. [1—7]. In those laser models, in order to have the optical gain on the corresponding transition a coherent pump is required to drive the systems, and additional pumps, coherent or incoherent, are also required. In 1993, Zhu Yifu presented a simple four-level model where only a single driving laser is required, The model can exhibit lasing without inversion on any state basis. In this note, we propose a closed three-level atomic model driven by a single pump field, perhaps the simplest pumping three-level scheme. By using the density-matrix equations, we study the steady-state behavior for the system and show that the simple system can exhibit inversionless laser between the lower excited state and the ground state.
机译：最近，人们越来越关注没有人口反转的激光研究。已经发现，在光学相干或量子干涉效应的帮助下，许多方案可以建立与参考文献中一样的光学现象。 [1-7]。在那些激光模型中，为了在相应的跃迁上具有光学增益，需要相干泵来驱动系统，并且还需要其他相干或不相干的泵。 1993年，朱Yi夫提出了一个简单的四层模型，该模型仅需要单个驱动激光器，该模型可以显示出激光发射，而不会在任何状态下反转。在本说明中，我们提出了一个单一泵浦场驱动的封闭三级原子模型，这可能是最简单的泵浦三级方案。通过使用密度矩阵方程，我们研究了系统的稳态行为，并表明简单系统可以在低激发态和基态之间表现出无反转激光。

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