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Proceedings Paper

Theoretical model for laser energy deposition in intrinsic optical materials and thermomechanical effects
Author(s): Florian Bonneau; Bernard Cazalis
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Paper Abstract

On the basis of a microscopic theory for the interaction of intense laser irradiation with free electrons over the range from visible to near infrared, we calculate space-time energy deposition in SiO2 for several wavelengths and laser pulsewidths. Most of the parameters used in the simulations are extracted from a Monte Carlo integration of the Boltzmann transport equation. We investigate the relative roles of multiphoton ionization, avalanche multiplication and free carrier absorption as intrinsic processes of carrier generation and pulse absorption for different laser irradiation conditions. The intensity profile distortion in the time domain of the transmitted pulse due to the rapid build-up of the plasma density is discussed. In the field of ultrashort laser pulses, damages exhibit a morphology dramatically different from that observed with long pulses: thin layers of material are removed by ablation. Therefore, we interfaced the space-time energy deposition with a 1D Lagrangian hydrodynamic code and estimated thermomechanical effects: stress evolution, spalling.

Paper Details

Date Published: 27 May 1996
PDF: 10 pages
Proc. SPIE 2714, 27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995, (27 May 1996); doi: 10.1117/12.240362
Show Author Affiliations
Florian Bonneau, CEA/Ctr. d'Etudes de Limeil-Valenton (France)
Bernard Cazalis, CEA/Ctr. d'Etudes de Limeil-Valenton (France)

Published in SPIE Proceedings Vol. 2714:
27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995
Harold E. Bennett; Arthur H. Guenther; Mark R. Kozlowski; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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