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8 July 2019 Structural defects in ultra-low laser absorption fused silica
Yuancheng Sun, Xiurong Du, Xiaoqiang Zhang, Xuefu Song, Ning Hua
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Proceedings Volume 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers; 110630C (2019) https://doi.org/10.1117/12.2539953
Event: Pacific Rim Laser Damage 2019 and Thin Film Physics and Applications 2019, 2019, Qingdao, China
Abstract
Fused silica is used as windows or lens in high power laser system. Slight laser absorption in it may results in huge damage caused by thermal effects. In order to reduce the bulk optical absorption in fused silica, mechanism of laser absorption in fused silica was studied from the perspective of structural defects. Ultra-purity fused silica was synthesized by high frequency plasma chemical vapor deposition (PCVD) process. Characteristics of structural defects includes hydroxyl, metal impurities, oxygen vacancy, bubbles and invisible stripe were studied by transmission spectrum, infrared reflection spectrum, stress birefringence, confocal microscope and impurity analyses. Formation mechanism of structural defects in fused silica was analyzed according to deposition process and vitrifying mechanism of silica. And influence of structural defects on bulk optical absorption was analyzed. By controlling structural defects, ultra-low laser absorption fused silica was synthesized by PCVD process.
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Yuancheng Sun, Xiurong Du, Xiaoqiang Zhang, Xuefu Song, and Ning Hua "Structural defects in ultra-low laser absorption fused silica", Proc. SPIE 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers, 110630C (8 July 2019); https://doi.org/10.1117/12.2539953
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KEYWORDS
Silica
Absorption
Glasses
Particles
Plasma
Silicon
Laser systems engineering
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