固体激光器是一个四能级系统。
在封闭腔，对理想的四能级激光系统，无辐射衰减速率为零时微腔激光器的光输出特性是线性的。
In the closed microcavity of an ideal four-level laser system, when nonradiative depopulation is zero, the light output property of the microcavity laser is linearly.
通过对四能级均匀加宽激光器单频功率的分析得到最大单频输出功率的简化解析结果；
A simplified analytical expression of maximum single frequency output is obtained by the analysis of a homogeneously broadened four-level system;
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