强激光对光学材料损伤的标度研究

E. Maldutis
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引用次数: 2

摘要

本文简要回顾了激光诱导损伤空间尺度化的主要原因,当损伤是由第一次激光发射(1对1)和N次激光脉冲序列到同一位置(N对1)引起的。结果表明,在某些情况下,激光脉冲形状对激光损伤和标度有重要影响。N-on-1过程材料性能变化的累积和LID阈值与前后脉冲斜率有很强的依赖性,随着脉冲斜率的增加,材料性能残余变化变小,最终累积损伤消失。当损伤尺度由自聚焦过程和SBS过程的竞争来定义时,长前坡有利于SBS过程。该理论模型解释了第一次激光发射(1对1)、激光脉冲序列(n对1 LID)、累积和损伤缩放。当光子能量比物质电离(hν)低2倍以上时,激光辐射对透明介质的体积损伤
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Scaling in damage of optical materials by intensive laser radiation
This is a short review of the main reasons of the laser induced damage space scaling, when damage is caused by the first laser shoot (1-on-1) and by the sequence of N laser pulses to one and the same place (N-on-1). It is shown that the laser pulse shape is important to laser damage and scaling in some cases. The accumulation of material property changes and LID threshold for N-on-1 process has strong dependence on the front and on the back pulse slopes: the material property remnant changes become les and eventually accumulative damage disappears when the pulse slopes are increased. When damage scaling is defined by competition of the self-focusing and SBS processes, the long front slope is favored to SBS. The theoretical model explains damage from the first laser shot (1-on-1), damage from sequence of laser pulses (N-on-1 LID), accumulation and damage scaling. The volume damage of transparent dielectrics by laser radiation, when photon energy is more then twice less material ionization (hν
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