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Proceedings Paper

Using shaped pulses to probe energy deposition during laser-induced damage of SiO2 surfaces
Author(s): C. W. Carr; D. Cross; M. D. Feit; J. D. Bude
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Paper Abstract

Laser-induced damage initiation in silica has been shown to follow a power-law behavior with respect to pulse-length. Models based on thermal diffusion physics can successfully predict this scaling and the effect of pulse shape for pulses between about 3ns and 10ns. In this work we use sophisticated new measurement techniques and novel pulse shape experiments to test the limits of this scaling. We show that simple pulse length scaling fails for pulses below about 3ns. Furthermore, double pulse initiation experiments suggest that energy absorbed by the first pulse is lost on time scales much shorter than would be predicted for thermal diffusion. This time scale for energy loss can be strongly modulated by maintaining a small but non-zero intensity between the pulses. By producing damage with various pulse shapes and pulse trains it is demonstrated that the properties of any hypothetical thermal absorber become highly constrained.

Paper Details

Date Published: 30 December 2008
PDF: 8 pages
Proc. SPIE 7132, Laser-Induced Damage in Optical Materials: 2008, 71321C (30 December 2008); doi: 10.1117/12.804460
Show Author Affiliations
C. W. Carr, Lawrence Livermore National Lab. (United States)
D. Cross, Lawrence Livermore National Lab. (United States)
M. D. Feit, Lawrence Livermore National Lab. (United States)
J. D. Bude, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 7132:
Laser-Induced Damage in Optical Materials: 2008
Gregory J. Exarhos; Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editor(s)

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