激光技术, 2007, 31 (1): 0004, 网络出版: 2010-06-03   

飞秒-纳秒脉冲激光烧蚀金属热效应分析

Thermal analysis of metal ablation by means of femtosecond-to-nanosecond laser pulses
作者单位
江西师范大学 物理与通信电子学院,南昌 330022
摘要
为了描述不同脉冲激光烧蚀金属表面作用过程,从双温模型出发,用有限元差分法对飞秒、皮秒和纳秒脉冲烧蚀金属表面的温度场进行了数值求解,将结果与不同的激光脉冲宽度内约化双温方程得到的解析解和简化方程进行了比较,并讨论了这些简化方程的适用范围和简化的合理性,还讨论了电子热流表达式与辐照激光光强的关系。计算结果表明,在不同脉冲宽度内的约化方程所得结果与双温模型数值求解符合得很好,证明了在飞秒领域,晶格温度可认为是常数,双温模型被简化为自由电子的温度变化方程;在皮秒激光领域,要用完整的双温方程描述;纳秒脉冲期间认为电子晶格温度相等,双温模型被简化为热传导方程。
Abstract
Based on double-temperature equation,the temperature field of metal ablation by means of femtosecond,picosecond and nanosecond laser pulses is numerically calculated with finite-difference method to describe different laser pulses ablation on metal surface. The derived results are compared with those obtained with the approximate analytical expressions and simplified equations. Then the application range scope of the different simplified equations and the reasonability of simplification are discussed. The relationship between the electron heat flux expression and the laser intensity is also analyzed. The calculation shows that the results of the simplified equations are consistent with the numerical calculation results obtained with the double-temperature equation. It is proved that the temperature of the lattice can be treated as a constant and the double-temperature equation reduces to the electron temperature equation for femtosecond scale laser pulses,the system should be described by a complete double-temperature equation for picosecond laser pulses,and that the electron and lattice temperature are equal and the model is reduced to a heat conduction equation during for nanosecond laser pulses.

邓素辉, 陶向阳, 刘明萍, 周彩玉. 飞秒-纳秒脉冲激光烧蚀金属热效应分析[J]. 激光技术, 2007, 31(1): 0004. DENG Su-hui, TAO Xiang-yang, LIU Ming-ping, ZHOU Cai-yu. Thermal analysis of metal ablation by means of femtosecond-to-nanosecond laser pulses[J]. Laser Technology, 2007, 31(1): 0004.

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