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把功率谱密度分析的方法引入到激光束光束质量的评价中 ,分析了自聚焦激光束的近场分布 ,研究了强激光非线性自聚焦的一般规律 ,给出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B积分阈值条件 ,实验和理论模拟结果基本一致 .
The method of power spectral density analysis is introduced into the evaluation of laser beam quality. The near-field distribution of self-focusing laser beam is analyzed. The general law of nonlinear laser self-focusing is studied. After neodymium glass medium self-focusing filament effect B-integral threshold conditions, the experimental and theoretical simulation results are basically the same.