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Optical Engineering

Study of thermal behaviors in CO2 laser irradiated glass
Author(s): Chaoyang Wei; Hongbo He; Zhi Deng; Jianda Shao; Zhengxiu Fan
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Paper 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.

Paper Details

Date Published: 1 April 2005
PDF: 4 pages
Opt. Eng. 44(4) 044202 doi: 10.1117/1.1882374
Published in: Optical Engineering Volume 44, Issue 4
Show Author Affiliations
Chaoyang Wei, Shanghai Institute of Optics and Fine Mechanics (China)
Hongbo He, Shanghai Institute of Optics and Fine Mechanics (China)
Zhi Deng, Shanghai Institute of Optics and Fine Mechanics (China)
Jianda Shao, Shanghai Institute of Optics and Fine Mechanics (China)
Zhengxiu Fan, Shanghai Institute of Optics and Fine Mechanics (China)


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