Paper
6 October 2010 Antireflective gradient index silica films for high power laser applications
Lianghong Yan, Haibing Lv, Shaobo He, Xiaodong Yuan, Wanguo Zheng
Author Affiliations +
Proceedings Volume 7655, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 765519 (2010) https://doi.org/10.1117/12.867596
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China
Abstract
Antireflective films are widely applied in optical areas due to their ability of reducing reflection and increasing transmittance of light. A process of depositing antireflective gradient index silica films on fused silica and other optical material surfaces is reported. The films possess the properties of wide-spectrum antireflective transmittance and high laser induced damage threshold. To prepare the film, there is first prepared a silica sol by a controlled proportion of water to alkoxide and a controlled concentration of alkoxide to solution, along with a small amount of catalyst. The prepared sol is dipping deposited onto vitreous substrate, resulting in silica layers with thickness of ~300nm and pore diameter of ~8nm. The silica layer is then etched in order to modify the pores in a graded fashion, forming antireflective gradient index silica films. The films display better than 99.0% transmittance through the entire 1053-350 nm band and laser induced damage threshold as high as 12 J/cm2 at 351 nm, meeting a significant technological requirement.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lianghong Yan, Haibing Lv, Shaobo He, Xiaodong Yuan, and Wanguo Zheng "Antireflective gradient index silica films for high power laser applications", Proc. SPIE 7655, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 765519 (6 October 2010); https://doi.org/10.1117/12.867596
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KEYWORDS
Silica

Refractive index

Antireflective coatings

Transmittance

Laser induced damage

Laser damage threshold

Gradient-index optics

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