A nodule dome removal strategy to improve the laser-induced damage threshold of coatings

被引：0
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作者：
Liu, Tianbao [1 ,2 ]
Zhu, Meiping [1 ,2 ,3 ,4 ]
Du, Wenyun [1 ,2 ]
Shi, Jun [1 ,2 ,3 ]
Sun, Jian [1 ,4 ]
Chai, Yingjie [5 ]
Shao, Jianda [1 ,2 ,3 ,4 ]
机构：
[1] Laboratory of Thin Film Optics, Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
[2] Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
[3] Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China
[4] Cas Center for Excellence in Ultra-intense Laser Science, Shanghai, China
[5] Creol, College of Optics and Photonics, University of Central Florida, Orlando, United States
来源：
High Power Laser Science and Engineering | 2022年 / 10卷
关键词：
E-field - Electric (E)-field enhancement - Field enhancement - High power laser facility - Laser coatings - Laser induced damage thresholds - Localised - Mirror coating - Nodule defect - Nodule dome removal;
D O I：
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学科分类号：
摘要：
Various coatings in high-power laser facilities suffer from laser damage due to nodule defects. We propose a nodule dome removal (NDR) strategy to eliminate unwanted localized electric-field (E-field) enhancement caused by nodule defects, thereby improving the laser-induced damage threshold (LIDT) of laser coatings. It is theoretically demonstrated that the proposed NDR strategy can reduce the localized E-field enhancement of nodules in mirror coatings, polarizer coatings and beam splitter coatings. An ultraviolet (UV) mirror coating is experimentally demonstrated using the NDR strategy. The LIDT is improved to about 1.9 and 2.2 times for the UV mirror coating without artificial nodules and the UV mirror coating with artificial nodule seeds with a diameter of 1000 nm, respectively. The NDR strategy, applicable to coatings prepared by different deposition methods, improves the LIDT of laser coating without affecting other properties, such as the spectrum, stress and surface roughness, indicating its broad applicability in high-LIDT laser coatings. ©
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