Study of thermal behaviors in CO2 laser irradiated glass

Chaoyang Wei; Hongbo He; Zhi Deng; Jianda Shao; Zhengxiu Fan

doi:10.1117/1.1882374

1 April 2005 Study of thermal behaviors in CO₂ laser irradiated glass

Chaoyang Wei, Hongbo He, Zhi Deng, Jianda Shao, Zhengxiu Fan

Author Affiliations +

Optical Engineering, Vol. 44, Issue 4, 044202 (April 2005). https://doi.org/10.1117/1.1882374

Abstract

To understand mechanisms underlying laser-induced damage of BK7 and fused silica, we calculate the temperature field of the substrates with CO₂ laser irradiating at a given laser power and beam radius. We find that the two glasses show different thermal behaviors. A model is developed for estimating the time t to heat the surface of the substrates up to a particular temperature T with cw CO₂ laser irradiation. We calculate theoretically the duration t that the samples are irradiated, from the beginning to visual catastrophic damage, with the assumption of damage threshold determined by the critical temperature. The duration t that the samples are irradiated, from the beginning to visual catastrophic damage, is investigated experimentally as well. Here we take the melting point or softening point as the critical temperature, given the thermomechanical coupling properties, which is enough to cause damage for BK7. Damage features are characterized by the sound of visual cracks. Finally, we calculate stresses induced by laser heating. The analysis of stress indicates that the damage of BK7 is due to the stresses induced by laser heating.

©(2005) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Chaoyang Wei, Hongbo He, Zhi Deng, Jianda Shao, and Zhengxiu Fan "Study of thermal behaviors in CO₂ laser irradiated glass," Optical Engineering 44(4), 044202 (1 April 2005). https://doi.org/10.1117/1.1882374

Published: 1 April 2005

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