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Radiation resistance of single and multilayer coatings against synchrotron radiation

机译：单层和多层涂层对同步辐射的抗辐射性

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Optical coatings for the use in free electron laser systems have to withstand high power laser radiation and the intense energetic background radiation of the synchrotron radiation source. In general, the bombardment with high energetic photons leads to irreversible changes and a discoloration of the specimen. For the development of appropriate optical coatings, the degradation mechanisms of available optical materials have to be characterized. In this concribution the degradation mechanisms of single layer coatings (fluoride and oxide materials) and multilayer systems will be presented. Fluoride and oxide single layers were produced by thermal evaporation and high energetic ion beam sputter deposition. The same methods were employed for the deposition of multilayer systems. High reflecting coatings for the wavelength region around 180nm were chosen for the irradiation tests. All samples were characterized after production by spectrophotometry covering the VUV , VIS, and MIR spectral range. Mechanical coating stress was evaluated with interferometrie methods. Synchrotron irradiation tests were performed at ELETTRA, using a standardized irradiation cycle for all tests. Ambient pressure and possible contamination in the vacuum environment were monitored by mass spectrometry. For comparison, the optical coatings were investigated again in the VUV, VIS, and MIR spectral range after irradiation. On selected samples XRD measurements were performed. The observed degradation mechanisms comprise severe damages like coating and substrate surface ablation. Color centre formation in the VIS spectral range and an increase of VUV absorption were found as a major origin for a severe degradation of VUV transmittance On the basis of the performed investigations, a selection of coating materials and coating systems is possible in respect to the damage effects caused by synchrotron radiation.
机译：在自由电子激光系统中使用的光学涂层必须能够承受高功率激光辐射和同步加速器辐射源的强能背景辐射。通常，高能光子轰击会导致不可逆的变化和样品变色。为了开发合适的光学涂层，必须表征可用光学材料的降解机理。在这种情况下，将介绍单层涂层（氟化物和氧化物材料）和多层体系的降解机理。通过热蒸发和高能离子束溅射沉积产生氟化物和氧化物单层。采用相同的方法沉积多层系统。选择用于180nm左右波长区域的高反射涂层进行辐照测试。生产后，通过分光光度法对所有样品进行了表征，涵盖了VUV，VIS和MIR光谱范围。机械涂层应力通过干涉法进行评估。同步辐射测试是在ELETTRA进行的，所有测试均使用标准化的辐射周期。通过质谱监测真空环境中的环境压力和可能的污染。为了进行比较，在辐照后再次在VUV，VIS和MIR光谱范围内对光学涂层进行了研究。在选定的样品上进行XRD测量。观察到的降解机理包括涂层和基材表面烧蚀等严重损坏。发现在VIS光谱范围内形成色心和增加VUV吸收是VUV透射率严重降低的主要原因。根据进行的研究，可以针对损伤选择涂料和涂料系统同步辐射引起的效应。

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