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

Gas lasers

Glasses

Carbon monoxide

Laser irradiation

Visualization

Temperature metrology

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