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在平凹稳定腔中用Ｃｒ４＋ＹＡＧ作为可饱和吸收体实现了脉冲ＮｄＹＡＧ激光器的被动锁模运转，得到平均脉宽为１９０ｐｓ，输出能量为２２ｍＪ的脉冲序列。理论上分析了Ｃｒ４＋ＹＡＧ被动锁模的动力学过程以及ＮｄＹＡＧ的克尔透镜自聚焦在被动锁模中的作用
The pulse NdYAG laser was mode-locked by using Cr4 + YAG as saturable absorber in the plano-concave stable cavity. The pulse sequence with average pulse width of 190ps and output energy of 22mJ was obtained. The dynamic process of Cr4 + YAG passively mode-locked and the role of Kerr lens self-focusing of NdYAG in passive mode-locking are theoretically analyzed