Variation of the target absorptance and target temperature distribution before melting in the pulsed laser ablation process
Variation of the target absorptance and target temperature distribution before melting in the pulsed laser ablation process
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DOI：
10.7498/aps.54.1283
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发表时间：
2005-03
期刊：
影响因子：
--
通讯作者：
Zhang Duan-ming;Li Li-Li;Ling Zhi-hua;Guan Li;Hou Si-Pu;Tan Xin-Yu
中科院分区：
文献类型：
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作者：
Zhang Duan-ming;Li Li-Li;Ling Zhi-hua;Guan Li;Hou Si-Pu;Tan Xin-Yu
讨论了靶材吸收率的变化对靶材熔化前温度分布的影响。导出了目标吸光量随时间的变化关系。在此基础上，结合入射能量密度的实际形态为高斯分布，建立了相应的热流方程。采用有限差分法，求解了适当边界条件下的热流方程。我们得到了温度随时间和地点的分布。同时，我们还详细讨论了相关过程的物理图。最后，我们研究了吸光度的变化和入射能量密度分布对相关过程的影响。结果表明，在脉冲激光过程中，目标吸光度的变化对最终的仿真结果有重要影响。如果忽略这种变化，理论结果和实验数据之间会有显著的差异。
We have discussed the effect of the variation of target absorptance on the temperature distribution of the target before melting. The relationship of the target absoptance with time is derived. Based on this relationship and the actual shape of incident energy density which is a Gauss distribution, the relevant heat flow equation is set up. By using the finite difference method, heat flow equation under an appropriate boundary condition is solved. We have obtained the temperature distribution as function of time and location. At the same time, we have also discussed the physical picture of a relevant process in detail. Finally, we have studied the effect of the variation of absorptance and the distribution of incident energy density on the relevant process. The result shows that during the pulsed laser process, the variation of target absorptance has an important effect on the final simulation result. If this variation is neglected, a remarkable difference can be found between theoretical results and experimental data.