6 December 2016 First-principles calculations for initial electronic excitation in dielectrics induced by intense femtosecond laser pulses
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Abstract
Laser-induced damage of SiO2 (α-quartz) is investigated by first-principles calculations. The calculations are based on a coupled theoretical framework of the time-dependent density functional theory and Maxwell equation to describe strongly-nonlinear laser-solid interactions. We simulate irradiation of the bulk SiO2 with femtosecond laser pulses and compute energy deposition from the laser pulse to electrons as a function of the distance from the surface. We further analyze profiles of laser-induced craters, comparing the transferred energy with the cohesive energy of SiO2. The theoretical crater profile well reproduces the experimental features for a relatively weak laser pulse. In contrast, the theoretical result fails to reproduce the measured profiles for a strong laser pulse. This fact indicates a significance of the subsequent atomic motions that take place after the energy transfer ends for the formation of the crater under the strong laser irradiation.
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Shunsuke A. Sato, Shunsuke A. Sato, Kazuhiro Yabana, Kazuhiro Yabana, } "First-principles calculations for initial electronic excitation in dielectrics induced by intense femtosecond laser pulses", Proc. SPIE 10014, Laser-Induced Damage in Optical Materials 2016, 100141A (6 December 2016); doi: 10.1117/12.2243012; https://doi.org/10.1117/12.2243012
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