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11 October 2024 Properties of SiO2 antireflective films for SG II in atmospheric pressure humidity environments
Bin Shen, Xu Zhang, Huai Xiong, Haiyuan Li, Xinglong Xie
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Proceedings Volume 13287, Nineteenth National Conference on Laser Technology and Optoelectronics; 1328702 (2024) https://doi.org/10.1117/12.3036484
Event: Nineteenth National Conference on Laser Technology and Optoelectronics, 2024, Shanghai, China
Abstract
Sol-gel SiO2 antireflective (AR) film is an important part of the components in "SG II" high power laser device, which plays a technical support in the inertial confinement fusion experiment. Due to its high porosity and large specific surface, it is susceptible to complex environmental conditions during the operation of the device, including humidity change, which will lead to uncertainty in the results of physical experiments. The degree of influence about humidity conditions on the various key properties of SiO2 AR film can be systematically understood by tracking and testing the changes in water contact angle (WCA), transmittance, laser induced damage threshold (LIDT), etc. of that under different humidity conditions for about 24 weeks. Results show that the contact angles and transmittances of SiO2 AR films decrease with increasing humidity. The WCA of the films decrease from 120° to 89.2°, and the peak transmittances decrease by about 0.2% when the relative humidity is 49%, the films had a trend of hydrophilic and becoming thinner. SiO2 AR films have an improving effect on the surface roughness of components, the surface roughness of the components with SiO2 AR film is less than 1 nm, and basically not affected by humidity environment. While the LIDTs of SiO2 AR films increase with the increasing humidity. In order to ensure the long-term stability of the key properties of the components with SiO2 AR films, the ideal storage and working humidity environment for components with SiO2 AR films is 24%~49% based on the test results of various performance factors.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Bin Shen, Xu Zhang, Huai Xiong, Haiyuan Li, and Xinglong Xie "Properties of SiO2 antireflective films for SG II in atmospheric pressure humidity environments", Proc. SPIE 13287, Nineteenth National Conference on Laser Technology and Optoelectronics, 1328702 (11 October 2024); https://doi.org/10.1117/12.3036484
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KEYWORDS
Humidity
Relative humidity
Silica
Laser damage threshold
Transmittance
Antireflective coatings
Surface roughness
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