Strong nonlinear growth of energy coupling during laser irradiation of transparent dielectrics and its significance for laser induced damage
Strong nonlinear growth of energy coupling during laser irradiation of transparent dielectrics and its significance for laser induced damage
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DOI：
10.1063/1.4707755
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发表时间：
2011-04
影响因子：
3.2
通讯作者：
G. Duchateau;M. Feit;S. Demos
中科院分区：
文献类型：
--
作者：
G. Duchateau;M. Feit;S. Demos
高功率纳秒激光脉冲与吸收缺陷的相互作用，位于大部分的透明介质材料，并具有多级电子结构，解决。该模型假设了一个温和的本地化的初始吸收，强烈增强激光脉冲期间通过激发态吸收和热驱动的周围材料中的新的点缺陷的产生。该模型适用于激光诱导的损伤引发的磷酸二氢钾晶体（KH2PO4或KDP）的散装和地址如何在一小部分的脉冲持续时间的缺陷簇周围的主机材料被转化为一个强的吸收体，导致足够大的能量耦合，导致在一个损坏的事件。这种情况下支持的时间分辨成像的材料修改在初始阶段的激光诱导损伤KDP和熔融石英。
The interaction of high power nanosecond laser pulses with absorbing defects, located in the bulk of transparent dielectric materials and having a multilevel electronic structure, is addressed. The model assumes a moderate localized initial absorption that is strongly enhanced during the laser pulse via excited state absorption and thermally driven generation of new point defects in surrounding material. This model is applied to laser induced damage initiation in the bulk of potassium dihydrogen phosphate crystals (KH2PO4 or KDP) and addresses how during a fraction of the pulse duration the host material around the defect cluster is transformed into a strong absorber that leads to the sufficiently large energy coupling resulting in a damage event. This scenario is supported by time resolved imaging of material modification during the initial phases of laser induced damage in KDP and fused silica.