Study of laser-induced damage in fused silica by 351 nm laser near-filed irradiation

被引：0

作者：

Guo, Yajing ^{[1
]}

Tang, Shunxing ^{[1
]}

Tang, Qing ^{[1
]}

Zhu, Baoqiang ^{[1
]}

Lin, Zunqi ^{[1
]}

机构：

[1] Joint Laboratory for High Power Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences

来源：

Zhongguo Jiguang/Chinese Journal of Lasers | 2013年 / 40卷 / 05期

关键词：

Damage induced by 351 nm laser; Image segmentation algorithm; Laser near field; Laser optics;

D O I：

10.3788/CJL201340.0502004

中图分类号：

学科分类号：

摘要：

Damage experiments are conducted by irradiating 351 nm laser near-filed to fused silica based on the damage threshold definition of near-filed irradiating. Damage areas are extracted from damage images by the marker-based watershed algorithm with gray control. The initial damage threshold is defined as the fluence of critical site between damage region and no damage region, which is calculated by comparing the damage image with 351 nm laser near-field. This damage testing method is sample, quick, which can effectively decrease the effect of beam diameter for damage threshold due to the bigger aperture. The algorithm of image segmentation effectively removes the noise and suppresses the over-segmentation, and improves the accuracy of initial damage and damage growth. The research shows that the damage of fused silica is induced by 351 nm laser near-field with pulse width of 3.13 ns. The initial damage threshold is 2.94 J/cm2. With multiple irradiation of fused silica, the damage growth of exit surface is exponential, and the coefficient of damage growth is 0.32.

引用

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