光学学报, 2013, 33 (11): 1114002, 网络出版: 2013-10-20   

纳秒激光辐照下铝靶的光学与热物理性质研究

Study on Optical and Thermophysical Properties of Aluminum under Nanosecond Laser Irradiation
作者单位
1 装备学院研究生院, 北京 101416
2 装备学院激光推进及其应用国家重点实验室, 北京 101416
3 北京化工大学物理与电子科学系, 北京 100029
摘要
在激光烧蚀过程中,靶材的吸收系数、热导率、电导率、密度和反射率参数随着温度变化而变化。当靶材表面温度接近热力学临界温度Tc时,靶材高温部分由金属向非金属转变。将靶材划分两个温度区域(0.8Tc以下和0.8Tc以上),对以上参数进行了建模计算。结合一维热传导方程,计算得到了铝靶温度、吸收系数、热导率、电导率、密度和反射率的时间和空间分布特性,并给出了烧蚀深度随激光能量的变化情况。数值计算结果与实验结果符合较好,验证了模型的正确性。
Abstract
In the process of laser ablation, the target′s absorption coefficient, thermal conductivity, density and surface reflectivity are dependent on its temperature. When the target surface temperature approaches the thermodynamic critical temperature Tc, the high-temperature part of the target transits from metal to nonmetal. The target is divided into two temperature regions (below and above 0.8Tc) and a model is built up to calculate the above physical parameters. The temporal and spatial distribution of temperature, absorption coefficient and thermal conductivity of Al target are obtained by a one-dimensional heat conduction equation. Ablation depth is calculated as a function of laser pulse energies. Numerical results are in good agreement with the experimental results, which validate the presented model.
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常浩, 金星, 陈朝阳. 纳秒激光辐照下铝靶的光学与热物理性质研究[J]. 光学学报, 2013, 33(11): 1114002. Chang Hao, Jin Xing, Chen Zhaoyang. Study on Optical and Thermophysical Properties of Aluminum under Nanosecond Laser Irradiation[J]. Acta Optica Sinica, 2013, 33(11): 1114002.

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