由入射强激光束的强度或相位调制引起的小尺度纹波在经过非线性介质后 ,将产生强烈的自聚焦效应。在非线性相位延迟 ( B积分 )超过一定值后 ,将严重影响光束的近场强度分布 ,甚至造成丝状破坏。数值模拟和实验研究了在一定强度调制下的光束经过钕玻璃介质发生自聚焦成丝效应的阈值条件 ,以及非线性传输的一般规律。可以通过模拟计算 ,给出高功率激光系统设计中的 ΔB判据。 The small-scale ripple caused by the intensity or phase modulation of the incident intense laser beam will produce a strong self-focusing effect after passing through the nonlinear medium. After the nonlinear phase delay (B integral) exceeds a certain value, the near-field intensity distribution of the beam will be seriously affected, and even the filamentous damage will be caused. Numerical simulations and experiments are carried out to study the threshold conditions of the self-focusing filaments of neodymium glass under certain intensity modulation and the general rule of nonlinear transmission. Through the simulation calculation, gives the high-power laser system design in the ΔB criterion.