KDP表面微缺陷引起的纳秒级laser损伤的初始能量沉积及引发机理
Initial energy deposition and initiation mechanism of nanosecond laser damage caused by KDP surface micro-defects
摘要：
为了探索纳秒激光对磷酸二氢钾（KDP）表面损伤的起始机制，提出了一种缺陷辅助能量沉积模型，该模型涉及光强增强和子带隙能级结构.模拟结果解释了KDP晶体的激光损伤阈值比理论值低两个数量级的原因。利用激光损伤过程中出现的瞬态图像对模型进行了验证。此外，提出了对激光损伤最敏感的“危险”表面缺陷的尺寸。这一工作有助于在微纳尺度上阐明KDP表面缺陷引起纳秒激光损伤的初始能量沉积和引发机制。这对于理解激光与物质的相互作用以及改进高质量光学元件的加工工艺具有重要意义。
英文摘要：
To enable an exploration of the initiation mechanism of nanosecond laser damage on a potassium dihydrogen phosphate (KDP) surface, a defect-assisted energy deposition model is developed that involves light intensity enhancement and a sub-band gap energy level structure. The simulations provide an explanation on why the laser-induced damage threshold (LIDT) of the KDP crystal is two orders of magnitude lower than the theoretical value. The model is verified by use of the transient images that appear during the laser damage. In addition, the dimensions of the "dangerous" surface defects that are the most sensitive to the laser damage are proposed. This work enables clarification on the initial energy deposition (IED) and initiation mechanism of the nanosecond laser damage caused by the KDP surface defects on micro-nano scale. It is helpful in understanding the laser-matter interactions and to improve the processing technique for high quality optical components.
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