Improved two-temperature model and its application in ultrashort laser heating of metal films
Improved two-temperature model and its application in ultrashort laser heating of metal films
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DOI：
10.1115/1.2035113
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发表时间：
2005-10-01
影响因子：
--
通讯作者：
Tsai, HL
中科院分区：
文献类型：
--
作者：
Jiang, L;Tsai, HL
双温度模型已广泛用于预测金属超短激光加工中的电子和声子温度分布。然而，现有双温度模型中一些重要的热和光学特性的估计仅限于低激光注量，其中电子温度远低于费米温度。本文通过使用全运行量子处理来计算显着变化的特性，将现有的双温度模型扩展到高电子温度，包括电子热容量、电子弛豫时间、电子电导率、反射率和吸收系数。与已发表的实验结果相比，所提出的模型比现有的金膜模型更准确地预测损伤阈值。
The two-temperature model has been widely used to predict the electron and phonon temperature distributions in ultrashort laser processing of metals. However estimations of some important thermal and optical properties in the existing two-temperature model are limited to low laser fluences in which the electron temperatures are much lower than the Fermi temperature. This paper extends the existing two-temperature model to high electron temperatures by using full-run quantum treatments to calculate the significantly varying properties, including the electron heat capacity, electron relaxation time, electron conductivity, reflectivity, and absorption coefficient. The proposed model predicts the damage thresholds more accurately than the existing model for gold films when compared with published experimental results.