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Preparation of ultra-broadband antireflective coatings for amplifier blast shields by a sol–gel method

  • Huai Xiong (a1) (a2), Bin Shen (a1), Zhiya Chen (a1), Xu Zhang (a1), Haiyuan Li (a1), Yongxing Tang (a1) and Lili Hu (a3)...
Abstract

A type of $\unicode[STIX]{x1D706}/4$ $\unicode[STIX]{x1D706}/4$ ultra-broadband antireflective coating has been developed using modified low refractive silica and high refractive silica layers by a sol–gel dip coating method for amplifier blast shields of the Shen Guang II high power laser facility (SG-II facility). Deposition of the first layer (high refractive index silica) involves baking at $200\,^{\circ }\text{C}$ in the post-treatment step. The second layer (low refractive index, $n=1.20$ ) uses low refractive index silica sol modified by acid catalysis. Thermal baking at temperatures no less than $500\,^{\circ }\text{C}$ for 60 min offers chemical stability, ethanol scratch resistance, and resistance to washing with water. The average residual reflection of dual-side-coated fused silica glass was less than 1% in the spectral range from 450 to 950 nm. Transmission gain has been evaluated by taking into account angular light, and the results show that the transmission gain increases with increasing light incidence. Even at $60^{\circ }$ , the transmission spectrum of the broadband antireflective coating effectively covered the main absorption peak of Nd:glass.

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Copyright
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Corresponding author
Correspondence to: H. Xiong, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China. Email: xhuai1998@siom.ac.cn
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High Power Laser Science and Engineering
  • ISSN: 2095-4719
  • EISSN: 2052-3289
  • URL: /core/journals/high-power-laser-science-and-engineering
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