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Proceedings Paper

Damage mechanisms and transparency changes in CO2-laser-irradiated glass
Author(s): Franck Guignard; Michel L. Autric; Vincent Baudinaud
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Paper Abstract

Transverse excited atmospheric pressure CO2 laser induced damage on BK7 and fused silica has been investigated. Damage processes have been characterized by looking at the transparency changes during irradiation with a helium-neon laser and plasma formation, with a photodiode. Both results are compared with thermal coupling and damage threshold measurements. The two glass qualities show slightly different behavior. BK7 shows surface crazing after irradiation, fused silica shows micro-fractures formation. In both cases, residual tensile stresses induced near the surface on cooling is identified as the most likely cause of cracking. A model was developed to calculate temperature and residual stresses, calculations results gives good agreement with damage thresholds measured.

Paper Details

Date Published: 20 April 1998
PDF: 12 pages
Proc. SPIE 3244, Laser-Induced Damage in Optical Materials: 1997, (20 April 1998); doi: 10.1117/12.307014
Show Author Affiliations
Franck Guignard, Institute for Research on Non-Equilibrium Phenomena (France)
Michel L. Autric, Institute for Research on Non-Equilibrium Phenomena (France)
Vincent Baudinaud, Aerospatiale CCR DCR-BL (France)

Published in SPIE Proceedings Vol. 3244:
Laser-Induced Damage in Optical Materials: 1997
Gregory J. Exarhos; Arthur H. Guenther; Mark R. Kozlowski; M. J. Soileau, Editor(s)

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