The absorption of high-power nanosecond laser pulses in a porous matter is investigated through theoretical and numerical calculations. The effects of structural properties of the porous target such as size of pores and thickness of solid elements on the laser absorption are investigated. The time and space-dependent absorption coefficient of the laser created partially homogenized plasma is used in a plasma hydrodynamic code to reproduce the laser absorption and plasma formation processes in a porous matter. It is observed that the structural characteristics of the porous material can be optimized to significantly increase the laser energy absorption. For porous targets with pore sizes in the range 30–60 nm a value around 1000 nm could be desirable for the wall thickness to increase the laser absorption efficiency to more than 90%. The results can be advantageous in production of efficient laser absorber targets which are desirable in advanced applications such as inertial conf...

中文翻译：

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结构受控的纳米多孔材料可有效吸收激光

通过理论和数值计算研究了高功率纳秒激光脉冲在多孔物质中的吸收。研究了多孔靶的结构性质，例如孔的大小和固体元素的厚度对激光吸收的影响。激光产生的部分均质等离子体的时间和空间相关的吸收系数用于等离子体流体力学代码中，以再现多孔物质中的激光吸收和等离子体形成过程。观察到可以优化多孔材料的结构特征以显着增加激光能量吸收。对于孔径在30–60 nm范围内的多孔靶，对于壁厚而言，将激光吸收效率提高到90％以上可能是理想的。