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研究一个外场驱动上能级相干的能级系统。它可用来在任意态(裸态和缀饰态)均无粒子数反转时获得激光。An energy-level system with upper-level coherence driven by an external field is investigated. It is shown that a laser may develop without the need of population inversion in any state (bare or dressed states).
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