A model of laser-induced damage of KDP based on the coupling of statistics and heat transfer

G. Duchateau, A. Dyan
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引用次数: 1

Abstract

By coupling statistics and heat transfer, we investigate numerically laser-induced KDP crystal damage by multi-gigawatt nanosecond pulses. Our model is based on the heating of nanometric absorbing defects that may cooperate when they are sufficiently aggregated. In such a case, they induce locally a strong increase of temperature that may lead to a subsequent damage. Statistics is used to evaluate the initial defect cluster size distribution. When the crystal is illuminated, by considering in addition heat transfer processes, this approach allows to predict damage probabilities and the evolution of the damaged sites density as a function of the laser fluence. We show that the scaling law exponent, linking the critical laser fluence to its pulse duration, takes a value close to 0.3 departing from the standard 0.5 value that is in a good agreement with recents experiments. Furthermore, these results indicate that absorbers involved in KDP damage may be associated with a collection of planar defects.
基于统计与传热耦合的激光损伤模型
通过耦合统计和传热理论,研究了多吉瓦纳秒脉冲激光诱导的KDP晶体损伤。我们的模型是基于纳米吸收缺陷的加热,当它们充分聚集时,它们可能会合作。在这种情况下,它们引起局部温度的强烈升高,可能导致随后的损坏。统计用于评估初始缺陷簇大小分布。当晶体被照射时,通过考虑额外的传热过程,这种方法可以预测损伤概率和损伤部位密度的演变作为激光能量的函数。我们表明,将临界激光通量与其脉冲持续时间联系起来的标度律指数的值接近于0.3,而不是标准的0.5值,这与最近的实验结果很吻合。此外,这些结果表明,参与KDP损伤的吸收剂可能与平面缺陷的集合有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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