Growth of laser-induced damage in fused silica under nanosecond laser irradiation
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摘要: 利用Nd:YAG激光器研究了纳秒激光诱导熔石英光学玻璃的初始损伤及损伤增长,对比研究了损伤程度和损伤形貌随激光波长、能量密度、脉冲数及位置的变化规律，并对损伤机制进行了分析和讨论。研究结果表明：初始损伤受损伤先驱的物理化学性质和激光参数的影响，而损伤增长规律与初始损伤程度、激光参数和位置有关；后表面的损伤随脉冲数的增加呈指数关系增长，前表面则呈线性关系；裂纹的产生及其在后续脉冲辐照下的发展是后表面损伤增长的主要原因，高温等离子体表面刻蚀是前表面损伤增长的主要原因Abstract: The paper studies the initiated damage morphology and the subsequent damage growth on fused silicas exit-surface and input-surface in air under nanosecond laser irradiation at 1 064 nm and 532 nm. The results demonstrate a significant dependence of the initiated damage on laser parameters and surface defects characters, and of the damage growth on the laser wavelength, location and fluence. Exponential growth behavior appears for exit-surface and linear growth one for input-surface in the lateral side of the damage site with the increase of shot number. Possible reasons for the observed initiated damages and damage growth behaviors are discussed.
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Key words:
- laser-induced damage /
- fused silica /
- initiated damage /
- damage growth /
- damage morphology
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