Downstream intensification effects associated with CO2 laser mitigation of fused silica

M. Matthews, I. Bass, G. Guss, C. Widmayer, F. Ravizza
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引用次数: 40

Abstract

Mitigation of 351nm laser-induced damage sites on fused silica exit surfaces by selective CO2 treatment has been shown to effectively arrest the exponential growth responsible for limiting the lifetime of optics in high-fluence laser systems. However, the perturbation to the optical surface profile following the mitigation process introduces phase contrast to the beam, causing some amount of downstream intensification with the potential to damage downstream optics. Control of the laser treatment process and measurement of the associated phase modulation is essential to preventing downstream 'fratricide' in damage-mitigated optical systems. In this work we present measurements of the surface morphology, intensification patterns and damage associated with various CO2 mitigation treatments on fused silica surfaces. Specifically, two components of intensification pattern, one on-axis and another off-axis can lead to damage of downstream optics and are related to rims around the ablation pit left from the mitigation process. It is shown that control of the rim structure around the edge of typical mitigation sites is crucial in preventing damage to downstream optics.
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与CO2激光熔凝二氧化硅缓蚀相关的下游强化效应
通过选择性CO2处理减少熔融二氧化硅出口表面351nm激光诱导的损伤位点,可以有效地抑制高通量激光系统中限制光学元件寿命的指数增长。然而,在减缓过程之后对光学表面轮廓的扰动引入了光束的相位对比,导致一定程度的下游增强,有可能损坏下游光学器件。控制激光处理过程和测量相关的相位调制是必不可少的,以防止下游的“自相残杀”的损害减轻光学系统。在这项工作中,我们提出了与熔融二氧化硅表面的各种CO2减缓处理相关的表面形貌,强化模式和损伤的测量。具体来说,两个增强模式的组成部分,一个在轴上,另一个离轴会导致下游光学元件的损伤,并且与消融过程中留下的烧蚀坑周围的边缘有关。结果表明,控制典型缓减点边缘的边缘结构对于防止下游光学元件的损坏至关重要。
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