Abstract The use of high power pulsed lasers is an effective tool for microstructuring material surfaces. It appears particularly useful when the material has some characteristics making difficult using other procedures (e.g. a high hardness). The present work reports on the femtosecond-laser treatment on tantalum diboride ultra-high temperature ceramics with different starting porosity fractions. The interaction with the laser beam creates a pattern with a complex multi-scale structure on the ceramic surface, whose characteristics depend on accumulated laser fluence and pristine porosity. Optical properties are significantly changed, allowing to separately optimize the interaction of the material with electromagnetic radiation spectrally located in different regions. As a case study, we apply the proposed strategy considering high-temperature solar thermal absorber applications, where the independent management of UV–Visible-Near IR radiation (sunlight) and Mid-IR (thermal radiation at the operating temperatures) are required. The correlation between the typical sizes of the realized multi-scale structures and the optical parameters (solar absorptance and thermal emittance in our example application) is discussed using an original predictive approach. The method here shown can be extended to every situation where materials are required to simultaneously interact with electromagnetic radiation in various spectral ranges.

中文翻译：

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通过多尺度飞秒激光纹理调整宽光谱范围内表面的光学特性：TaB2 陶瓷的案例研究

摘要 高功率脉冲激光器的使用是一种有效的材料表面微结构化工具。当材料具有一些难以使用其他程序（例如高硬度）的特性时，它显得特别有用。目前的工作报告了飞秒激光处理具有不同起始孔隙率的二硼化钽超高温陶瓷。与激光束的相互作用在陶瓷表面形成具有复杂多尺度结构的图案，其特性取决于累积的激光能量密度和原始孔隙率。光学特性发生了显着变化，允许分别优化材料与光谱位于不同区域的电磁辐射的相互作用。作为案例研究，我们应用所提出的策略，考虑到高温太阳能吸热器应用，其中需要独立管理 UV-Visible-Near IR 辐射（太阳光）和 Mid-IR（工作温度下的热辐射）。使用原始预测方法讨论了实现的多尺度结构的典型尺寸与光学参数（在我们的示例应用中的太阳能吸收率和热辐射率）之间的相关性。此处显示的方法可以扩展到需要材料同时与各种光谱范围内的电磁辐射相互作用的每种情况。使用原始预测方法讨论了实现的多尺度结构的典型尺寸与光学参数（在我们的示例应用中的太阳能吸收率和热辐射率）之间的相关性。此处显示的方法可以扩展到需要材料同时与各种光谱范围内的电磁辐射相互作用的每种情况。使用原始预测方法讨论了实现的多尺度结构的典型尺寸与光学参数（在我们的示例应用中的太阳能吸收率和热辐射率）之间的相关性。此处显示的方法可以扩展到需要材料同时与各种光谱范围内的电磁辐射相互作用的每种情况。