Introducing ABCD theory, the laser mode was analyzed; With thermal effect consideration, a short folded-cavity resonator which was not sensitive to thermal effect was designed. Thus, the requirements for efficient doubling frequency were satisfied.

• 采用标准ABCD传输矩阵理论，对激光器腔模式进行了详细的分析，在充分考虑热效应的前提下，根据实际情况，合理设计出对热效应不敏感的三镜折叠腔，产生两个光腰，既满足了泵浦光能量的充分利用，也满足了缩小光腰提高倍频效率的要求。