First-principles calculations for initial electronic excitation in dielectrics induced by intense femtosecond laser pulses

Shunsuke A. Sato; Kazuhiro Yabana

doi:10.1117/12.2243012

6 December 2016 First-principles calculations for initial electronic excitation in dielectrics induced by intense femtosecond laser pulses

Shunsuke A. Sato, Kazuhiro Yabana

Author Affiliations +

Proceedings Volume 10014, Laser-Induced Damage in Optical Materials 2016; 100141A (2016) https://doi.org/10.1117/12.2243012
Event: SPIE Laser Damage, 2016, Boulder, Colorado, United States

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.

Citation Download Citation

Shunsuke A. Sato and 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); https://doi.org/10.1117/12.2243012

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