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Correlation between laser-induced-damage and nano-sized absorbing defects

机译：激光损伤与纳米吸收缺陷之间的关系

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In the context of high power laser applications like the French "Laser Megajoule" or the "National Ignition Facility" in the United States, laser-induced-damage in fused silica appears to be a limitation. Although it has been established that nano-sized defects are suspected to be responsible of the damage initiation in optical components, the induced-breakdown process is still unknown. The specific apparatus developed at the Institut Fresnel permits to study in real time the laser interaction on an isolated absorbing defect (around 100 nm): Indeed the coupling of a nanosecond focused laser (beam diameter about 10μm) and a high resolution pho-tothermal microscope (beam diameter 1μm) in a unique facility permits to highlight the evolution of the local absorption of the defect versus irradiation energy density. Furthermore, the morphology of this modification is followed thanks to a "refraction mapping" (photothermal deflection measured at frequency 0). An in-situ dark field microscope and an ex-situ AFM complete the observations. In order to simulate the presence of the nano-defects. engineered sub-micronic gold particles (100-600 nm) were embedded in silica samples. The whole observations contribute in the understanding of the different stages of the damage initiation and more particularly, a determination of a "pre-damage" threshold can be performed.
机译：在诸如法国的“ Laser Megajoule”或美国的“ National Ignition Facility”之类的高功率激光应用中，熔融石英中激光诱导的损坏似乎是一个限制。尽管已经确定纳米尺寸的缺陷被怀疑是造成光学元件损坏的原因，但是诱导的分解过程仍然是未知的。菲涅尔研究所开发的专用仪器可以实时研究孤立的吸收缺陷（约100 nm）上的激光相互作用：实际上，纳秒聚焦激光（光束直径约10μm）和高分辨率光热显微镜的耦合（光束直径1μm）在独特的设备中可以突出显示缺陷的局部吸收与辐射能量密度的关系。此外，由于“折射映射”（在频率0处测得的光热偏转）而遵循了这种修改的形态。现场暗场显微镜和非现场原子力显微镜完成了观察。为了模拟纳米缺陷的存在。工程亚微米金颗粒（100-600 nm）被嵌入二氧化硅样品中。整个观察有助于理解损伤开始的不同阶段，并且更具体地，可以执行“损伤前”阈值的确定。

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