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Proceedings Paper

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

Paper Details

Date Published: 6 December 2016
PDF: 7 pages
Proc. SPIE 10014, Laser-Induced Damage in Optical Materials 2016, 100141A (6 December 2016); doi: 10.1117/12.2243012
Show Author Affiliations
Shunsuke A. Sato, Univ. of Tsukuba (Japan)
Max Planck Institute for the Structure and Dynamics of Matter (Germany)
Kazuhiro Yabana, Univ. of Tsukuba (Japan)

Published in SPIE Proceedings Vol. 10014:
Laser-Induced Damage in Optical Materials 2016
Greg J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; MJ Soileau, Editor(s)

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