Lasers and Laser Optics

Study of thermal behaviors in CO2 laser irradiated glass

[+] Author Affiliations
Chaoyang Wei, Hongbo He, Zhi Deng, Jianda Shao, Zhengxiu Fan

Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics, Research and Development Center for Optical Thin Film Coatings, Number 390, Qinghe Road, Jiading, Shanghai 201800, China E-mail: siomwei@siom.ac.cn

Opt. Eng. 44(4), 044202 (Mar. 31, 2005). doi:10.1117/1.1882374
History: Received Apr. 13, 2004; Revised Jul. 19, 2004; Accepted Oct. 29, 2004; Mar. 31, 2005; Online April 01, 2005
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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.

© 2005 Society of Photo-Optical Instrumentation Engineers

Citation

Chaoyang Wei ; Hongbo He ; Zhi Deng ; Jianda Shao and Zhengxiu Fan
"Study of thermal behaviors in CO2 laser irradiated glass", Opt. Eng. 44(4), 044202 (Mar. 31, 2005). ; http://dx.doi.org/10.1117/1.1882374


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