Collection Of theses on high power laser and plasma physics, 2013, 11 (1): 0502004, Published Online: Jun. 2, 2017  

Study of Laser-Induced Damage in Fused Silica Irradiated by 351 nm Laser Near-Filed

Author Affiliations
中国科学院上海光学精密机械研究所高功率激光物理联合实验室, 上海 201800
Abstract
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 351nm 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.
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Guo Yajing, Tang Shunxing, Tang Qing, Zhu Baoqiang, Lin Zunqi. Study of Laser-Induced Damage in Fused Silica Irradiated by 351 nm Laser Near-Filed[J]. Collection Of theses on high power laser and plasma physics, 2013, 11(1): 0502004.

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