概述了高功率激光系统中小尺度自聚焦产生的机理及相应的评价标准和分析方法,重点对激光经过钕玻璃介质和频率转换晶体的小尺度自聚焦情况进行了分析和讨论,同时介绍了两种测量小尺度调制增长的方法。针对高功率激光系统,阐述了抑制小尺度自聚焦的几种方法,提出通过控制小尺度调制增量,减少高功率激光的非线性效应对光学元件损伤的方案。指出了聚变级高功率激光技术中非线性效应研究的发展趋势。 The mechanism of small-scale self-focusing in high-power laser system and its corresponding evaluation criteria and analysis methods are summarized. The small-scale self-focusing of laser passing through neodymium glass medium and frequency conversion crystal is emphatically analyzed and discussed. At the same time, two kinds of self- Method of measuring small scale modulation growth. Aiming at high power laser system, several methods to suppress the self-focusing at small scale are described. The scheme of reducing the damage to the optical element by controlling the small-scale modulation increment and reducing the nonlinear effect of high-power laser is proposed. The trend of nonlinear effect research in fusion level high power laser technology is pointed out.