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Localized CO2 laser treatment and post-heating process to reduce the growth coef f icient of fused silica surface damage
Authors:Shizhen Xu  Xiaotao Zu  and Xiaodong Yuan
Institution:1 School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China 2 Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Abstract:The lifetime of optical components in high-fluence ultraviolet (UV) laser applications is typically limited by laser-initiated damage and its subsequent growth. Using 10.6-μ m CO 2 laser pulses, we successfully mitigate 355-nm laser induced damage sites on fused silica surface with dimensions less than 200 μ m. The damage threshold increases and the damage growth mitigates. However, the growth coefficients of new damage on the CO 2 laser processed area are higher than those of the original sample. The damage grows with crack propagation for residual stress after CO 2 laser irradiation. Furthermore, post-heating is beneficial to the release of residual stress and slows down the damage growth.
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