The Numerical Simulation of Reflectivity of Aluminum Alloy Irradiated by Laser Beam
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摘要: 从金属近自由电子模型Prude/Fresnel理论出发，分析了激光作用下铝靶表面反射率的动态变化规律。通过对铝电导率与温度变化关系的数值模拟，得到了凝聚态、液态、气态反射率的动态变化规律，且与实验结果基本符合。当激光功率密度处于1011~1015 W/cm-2范围内时，由等离子体模型和局部热力学平衡（LTE）理论，亦得到了反射率随温度变化的数值模拟结果，与国外的实验结果符合得较好。Abstract: Based on the free electron model－the Drude/Fresnel theory, the variation of reflectivity of the aluminium surface under intense laser interaction is analyzed in this paper. From the numerical simulation of the relation of the aluminium conductivity with temperature, the instantaneous variations of the reflectivity at the aluminium surface in the solid, liquid and vapor states are conducted. The results are in accord with the experiments. When the laser power density is in the range from 1011~1015 W/cm-2, the numerical simulation results of the reflectivity with temperature are obtained according to the plasma model and the assumption of local thermal equilibrium (LTE). The results are approximate to the experimental results from abroad.
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Allmen M V. Laser-Beam Interaction with Materials Physical Principles and Applications. Berlin: Springer-Verlag, 1987. Wendlandt B C H. Theoretical Studies of the Interaction of High-Power Laser Beams and Metals. Australian: DSL Rept-547, 1973. Burgess T J. In: Fowler C M, et al, ed. Megagauss Technology and Pulsed Power Application. New York and London: Plenum Press, 1987: 307. Milchberg H M, et al. Phys Rev Lett, 1988, 61(20): 2364. 饭田修一, 等. 物理学常用数表. 北京: 科学出版社, 1979. -
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