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中文摘要：
主要对阶梯型三能级原子系统中无反转激光的产生作系统的理论分析。从光场与原子介质相互作用哈密顿量的表达式出发,得到存在自发诱导相干的阶梯型三能级原子系统在与探测、驱动光场近共振的相互作用,及与非相干泵浦场作用下的密度矩阵方程。由无反转激光产生的条件,判断自发辐射诱导相干以及非相干泵浦对其产生的影响。在稳态条件下,通过数值模拟对所得的图形进行理论的分析和讨论得出SGC会削弱LWI产生,而非相干泵浦能增强LWI效应的结论。
英文摘要：
An investigation into lasing without inversion in a Ladder-type three-level atomic system was conducted.With the exhibiting condition of lasing without inversion,the effects of the incoherent pumping and spontaneously generated coherence（SGC） have been studied in detail.The investigation shows that SGC can decrease the phenomena of lasing without inversion（LWI）.However,the incoherent pumping can strengthen it.
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