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Proceedings Paper

Interaction of laser pulse with confined plasma during exit surface nanosecond laser damage
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Paper Abstract

Interpretation of spatial and time resolved images of rear surface ns laser damage in dielectrics requires understanding of the dynamic interaction of the incoming laser beam with the confined expanding plasma in the material. The detailed kinetics of the plasma, involving both expansion and retraction, depends on details of reflection and absorption in the hot material. The growth of the hot region is treated using a model previously developed to understand laser peening. The pressure is found to scale as the square root of laser intensity and drops off slowly after energy deposition is complete. For the conditions of our experimental observations in fused silica, our model predicts a pressure of about 9 GPa and a surface expansion velocity of about 1.5 km/sec, in good agreement with experimental observation.

Paper Details

Date Published: 2 December 2013
PDF: 6 pages
Proc. SPIE 8885, Laser-Induced Damage in Optical Materials: 2013, 88851D (2 December 2013); doi: 10.1117/12.2030482
Show Author Affiliations
Alexander M. Rubenchik, Lawrence Livermore National Lab. (United States)
Michael D. Feit, Lawrence Livermore National Lab. (United States)
Stavros G. Demos, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 8885:
Laser-Induced Damage in Optical Materials: 2013
Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; MJ Soileau, Editor(s)

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