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首页> 外文期刊>International Journal of Heat and Mass Transfer >Modeling of ultrafast phase changes in metal films induced by an ultrashort laser pulse using a semi-classical two-temperature model
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Modeling of ultrafast phase changes in metal films induced by an ultrashort laser pulse using a semi-classical two-temperature model

机译：使用半经典两温模型对超短激光脉冲引起的金属膜中超快速相变建模

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摘要

A semi-classical two-temperature (2T) model, together with the extended Drude model for temperature-dependent optical properties, is proposed to describe ultrafast thermal transport and phase changes in gold films irradiated by an ultrashort laser pulse. This model reduces to a classical 2T model when the electron momentum equation and the two terms related to electron drifting velocity in the electron energy equation are dropped off. It is found that the significant changes in reflectivity and absorption coefficient due to rapid temperature rise could drastically alter laser energy deposition and in turn, the thermal response in metal films. It is also found that the semi-classical 2T model could predict lower electron and lattice temperature and less severe solid-liquid and liquid-vapor phase change than the classical 2T model. The difference could be more distinct with increase of laser fluence and/or increase of laser pulse duration.
机译：提出了一个半经典的两温（2T）模型，以及与温度相关的光学特性的扩展Drude模型，以描述由超短激光脉冲辐照的金膜的超快速热传输和相变。当电子动量方程式和与电子能量方程式相关的两个与电子漂移速度有关的项被舍弃时，该模型简化为经典的2T模型。已经发现，由于温度的快速升高，反射率和吸收系数的显着变化可能会大大改变激光能量的沉积，进而改变金属膜的热响应。还发现，与经典2T模型相比，半经典2T模型可以预测较低的电子和晶格温度，并且不严重的固液和液汽相变。随着激光注量的增加和/或激光脉冲持续时间的增加，差异可能更加明显。

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