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三能级∧型原子系统被非相干辐射场泵浦，在稳态情况下，系统产生无粒子数反转激光。本文分析了无反转时的增益及增益的起源。
The three-level Λ-type atomic system is pumped by non-coherent radiation field. Under steady-state conditions, the system produces a non-particle-inverted laser. This paper analyzes the origin of gain and gain without inversion.