以ＫＴＰ晶体作为ＮｄＹＡＰ锁模激光器的内腔倍频元件，在带非共振环（ＡＲＲ）的对撞脉冲锁模（ＣＰＭ）非稳腔和虚共焦非稳腔中实现高效倍频转换，其倍频能量转换效率分别为５３．４％和６０．２％。测定了两种腔型的基波脉宽分别为８ｐｓ和１８ｐｓ，二次谐波输出的最大能量起伏分别为１０．６％和１２．５％。理论分析了两种不同腔型及其实验结果的特点。 Using KTP crystal as the internal cavity frequency doubling element of the NdYAP mode-locked laser, high-efficiency frequency-doubling conversion is realized in a CPM unstable resonator and an imaginary confocal unstable resonator with an ARR The doubling frequency energy conversion efficiency is respectively 53.4% ​​and 60.2%. The fundamental pulse widths of the two cavity types were determined to be 8ps and 18ps, respectively. The maximum energy fluctuation of the second harmonic output was 10.6% and 12.5%, respectively. The characteristics of two different cavity types and their experimental results are analyzed theoretically.