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在下能级相干的型三能级系统得到了原子密度矩阵方程的严格解。在强相干情形分析了产生无反转激光的抽运条件,并导出了光强饱和项。The solution for the equations of atomic density matrix is obtained, without resorting to any approximation, in the Ξ-type of three-level system with lower-level coherence. The conditions on pumping are analyzed in the strong-coherence case for lasing without inversion and the saturation term is derived.
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