We study experimentally and numerically the increase in ultrashort laser pulse transmissivity through thin silver films caused by the heating of electrons. Low to moderate energy femtosecond laser pulse transmission measurements through 40–125 nm thickness silver films were carried out. We compare the experimental data with the values of transmitted fraction of energy obtained by solving the equations for the field together with the two-temperature model. The measured values were fitted with sufficient accuracy by varying the electron-electron collision frequency whose exact values are usually poorly known. Since transmissivity experiences more pronounced changes with the increase in temperature compared to reflectivity, we suggest this technique for studying the properties of nonequilibrium metals.We study experimentally and numerically the increase in ultrashort laser pulse transmissivity through thin silver films caused by the heating of electrons. Low to moderate energy femtosecond laser pulse transmission measurements through 40–125 nm thickness silver films were carried out. We compare the experimental data with the values of transmitted fraction of energy obtained by solving the equations for the field together with the two-temperature model. The measured values were fitted with sufficient accuracy by varying the electron-electron collision frequency whose exact values are usually poorly known. Since transmissivity experiences more pronounced changes with the increase in temperature compared to reflectivity, we suggest this technique for studying the properties of nonequilibrium metals.

中文翻译：

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通过薄银膜迅速增加超短激光脉冲传输

我们通过实验和数值研究了通过电子加热引起的银薄膜超短激光脉冲透射率的增加。通过 40-125 nm 厚的银膜进行低至中等能量飞秒激光脉冲传输测量。我们将实验数据与通过求解场方程以及双温度模型获得的能量传输分数的值进行比较。通过改变电子 - 电子碰撞频率，测量值具有足够的精度，其确切值通常知之甚少。由于与反射率相比，随着温度升高，透射率会发生更明显的变化，因此我们建议使用这种技术来研究非平衡金属的特性。我们通过实验和数值研究了通过电子加热引起的银薄膜超短激光脉冲透射率的增加。通过 40-125 nm 厚的银膜进行低至中等能量飞秒激光脉冲传输测量。我们将实验数据与通过求解场方程以及双温度模型获得的能量传输分数的值进行比较。通过改变电子 - 电子碰撞频率，测量值具有足够的精度，其确切值通常知之甚少。由于与反射率相比，随着温度升高，透射率会发生更明显的变化，因此我们建议使用这种技术来研究非平衡金属的特性。