重复频率脉冲激光作用下膜内包裹物对损伤阈值的影响

利用介质薄膜中包裹物的热理论模型，结合S.Papernov 等利用电子束蒸发技术在熔融石英上沉积含Au包裹物的HfO2薄膜实验，得出Au的吸收截面。以包裹物Au为例，计算了脉冲激光作用下不同包裹物半径对损伤阈值的影响，分析了重复率脉冲激光作用下薄膜损伤阈值的变化及重复频率与激光损伤阈值的关系。结果表明：随着包裹物半径的增加，激光损伤阈值先减小，接着增加而后再减小。激光损伤阈值与脉冲宽度的0.4次方成正比。随着脉冲重复频率的增加，激光损伤阈值单调下降，产生损伤所需的最小脉冲数则单调上升。

Damage induced by inclusions in coatings under repetition frequency pulse laser

By the model of damage induced by inclusions in dielectric thin-films, with the experiment done by S.Papernov et al who deposited HfO2 thin-films containing gold nanoparticles on a cleaved fused-silica by e-beam evaporation, the absorption cross-section of gold was obtained. Furthermore, the laser-induced damage thresholds of HfO2 film induced by Au inclusions with varies radius and varies repetition frequency were calculated. The results indicate that the minimum energy density causing damage decreases first, then increases, finally decreases again with the increasing impurity radius. The relationship between the damage threshold and the damage shot number both change near-linearly with the repetition rate increase, while the former is descending, and the latter is ascending.