本文主要的探讨了无粒子数反转激光的物理机制，建议了一种封闭的四能级无反转激光模型，并证明它也能够呈现无粒子数反转光放大现象。
This thesis mainly discusses the physics mechanism of lasing without inversion and proposed a closed four-level atomic model for the lasing without inversion.
本文主要的探讨了无粒子数反转激光的物理机制，建议了一种封闭的四能级无反转激光模型，并证明它也能够呈现无粒子数反转光放大现象。
This thesis mainly discusses the physics mechanism of lasing without inversion and proposed a closed four-level atomic model for the lasing without inversion.
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