自聚焦激光束光束质量评价的功率谱密度方法

Power spectra density estimation of quality of the laser beam passing through an self-focusing media

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 spectra density was introduced to estimate the quality of a high intensity laser beam, and the near-field of the self-focusing laser beam was analyzed. We obtained a certain DeltaB restriction of the laser beam. The results of numerical simulations were coincident with the experimental data very well.