Damage mechanisms and transparency changes in CO2-laser-irradiated glass

Franck Guignard; Michel L. Autric; Vincent Baudinaud

doi:10.1117/12.307014

20 April 1998 Damage mechanisms and transparency changes in CO2-laser-irradiated glass

Franck Guignard, Michel L. Autric, Vincent Baudinaud

Proceedings Volume 3244, Laser-Induced Damage in Optical Materials: 1997; (1998) https://doi.org/10.1117/12.307014
Event: Laser-Induced Damage in Optical Materials: 1997, 1997, Boulder, CO, United States

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.

Citation Download Citation

Franck Guignard, Michel L. Autric, and Vincent Baudinaud "Damage mechanisms and transparency changes in CO2-laser-irradiated glass", Proc. SPIE 3244, Laser-Induced Damage in Optical Materials: 1997, (20 April 1998); https://doi.org/10.1117/12.307014

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