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Proceedings Paper

Temperature and residual stress evolution in CO2-laser-irradiated glass
Author(s): Franck Guignard; Michel L. Autric; Vincent Baudinaud
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Paper Abstract

CO2 laser induced damage mechanisms on Borosilicate BK7 glass and fused silica have been investigated in order to get their damage thresholds and consequently, the transparence changes in the visible range. The absorption of the radiation leads to the heating of a thin layer close to the surface which induces thermal stresses. As long as temperature remains below the glassy temperature Tg, the glass behaves as an elastic material. At higher fluence, temperature increases over Tg, the glass starts to behave as a viscous liquid and stress relaxation occurs. During cooling to ambient temperature, this relaxation process leads to residual tensile stresses and if they exceed the tensile strength, cracks may appear. Residual stresses formation strongly depends on the laser pulse shape, the absorption coefficient related to the sample and the thermo-mechanical properties of glass. A 1- Dimensional numerical model has been developed to calculate the time evolution of temperature and stresses profiles inside the irradiated samples.

Paper Details

Date Published: 14 September 1998
PDF: 12 pages
Proc. SPIE 3343, High-Power Laser Ablation, (14 September 1998); doi: 10.1117/12.321542
Show Author Affiliations
Franck Guignard, IRPHE/Univ. Marseille (France)
Michel L. Autric, IRPHE/Univ. Marseille (France)
Vincent Baudinaud, Aerospatiale (France)

Published in SPIE Proceedings Vol. 3343:
High-Power Laser Ablation
Claude R. Phipps, Editor(s)

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