Characteristics of Laser-Induced Surface and Bulk Damage of Large-Aperture Deuterated Potassium Dihydrogen Phosphate at 351 nm
Characteristics of Laser-Induced Surface and Bulk Damage of Large-Aperture Deuterated Potassium Dihydrogen Phosphate at 351 nm
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大孔径氘代磷酸二氢钾351 nm激光诱导表面和体损伤特性
DOI：
10.1088/0256-307x/33/2/027803
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发表时间：
2016-02-01
影响因子：
3.5
通讯作者：
Gong, Ma-Li
中科院分区：
文献类型：
--
作者：
Han, Wei;Zhou, Li-Dan;Gong, Ma-Li
在大口径激光系统上研究了氘代磷酸二氢钾在351 nm波段的损伤特性。在6.7 J/cm（2）和3 J/cm（2）的3 Ω能量密度下，材料的体损伤和后表面损伤开始，在6 J/cm（2）能量密度的多次激光辐照下，材料的损伤表现出不同的生长特征。一旦启动，体损伤的大小和数量保持不变。然而，表面损伤尺寸也不增长，而表面损伤数量与激光照射线性增加。不同的损伤阈值和生长行为表明不同的形成体和表面损伤前体。表面损伤的原因被认为是埋在溶胶-凝胶涂层下的近表面吸收颗粒。
Deuterated potassium dihydrogen phosphate damage performance at 351nm is studied on a large-aperture laser system. Bulk and rear-surface damage are initiated under the 3 omega fluences of 6.7 J/cm(2) and 3 J/cm(2), and show different growth characteristics under multiple laser irradiations with the fluence of 6 J/cm(2). The size and number of bulk damage keep unchanged once initiated. However, surface damage size also does not grow, while surface damage number increases linearly with laser shots. Different damage thresholds and growth behaviors suggest different formations of bulk and surface damage precursors. The cause of surface damage is supposed to be near-surface absorbing particles buried under the sol-gel coating.