Laser-supported solid-state absorption fronts in silica

We develop a model based on simulation and experiment that explains the behavior of solid-state laser-supported absorption fronts generated in fused silica during high intensity (up to 5GW/cm{sup 2}) laser exposure. We find that the absorption front velocity is constant in time and is nearly linear...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2010-11, Vol.82 (18), Article 184304
Main Authors: Carr, C. W., Bude, J. D., DeMange, P.
Format: Article
Language:English
Subjects:
ABSORPTION
ABSORPTIVITY
DIELECTRIC MATERIALS
ELECTRONS
ENGINEERING
LASERS
SILICA
SIMULATION
THERMAL DIFFUSION
TRANSPORT
VELOCITY
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Summary:We develop a model based on simulation and experiment that explains the behavior of solid-state laser-supported absorption fronts generated in fused silica during high intensity (up to 5GW/cm{sup 2}) laser exposure. We find that the absorption front velocity is constant in time and is nearly linear in laser intensity. Further, this model can explain the dependence of laser damage site size on these parameters. This behavior is driven principally by the temperature-activated deep sub band-gap optical absorptivity, free electron transport and thermal diffusion in defect-free silica for temperatures up to 15,000K and pressures < 15GPa. The regime of parameter space critical to this problem spans and extends that measured by other means. It serves as a platform for understanding general laser-matter interactions in dielectrics under a variety of conditions.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.82.184304