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Preparation of polysiloxane coating for laser application with improved curing property based on copolymerization modification

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Abstract

The sol–gel method is an important process for the preparation of laser frequency conversion components, such as dihydrogen phosphate (KDP), which are often employed in high-power laser facility. Methyltriethoxysilane (MTS) precursor is a typical matrix to prepare polysiloxane under hydrolysis and polycondensation process. Further coating and curing procedure is applied to obtain desired polysiloxane coating which acts as the moisture-proof and refractive index matching layer. Subsequently, an antireflective coating is prepared over this polysiloxane coating (a bilayer coating system) to realize ultrahigh transmission at desired wavelengths. Due to the low curing temperature (limited by the phase transition temperature of KDP), current MTS-polysiloxane coating could not be completely cured and inter-coating permeation between this bilayer coating system would lead to deterioration of coating properties. Thus, copolymerization of MTS and tetraethylorthosilicate (TEOS) is adopted to fabricate the polysiloxane coating with improved curing property (denser structure and higher hardness after curing). It is found that under certain molar ratio of MTS to TEOS, the structure of modified polysiloxane coating could be effectively densified and the coating hardness increases significantly. Meanwhile, the bilayer coating system still exhibits excellent transmission, high laser-induced damage threshold as well as satisfactory moisture resistance.

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Acknowledgment

This work is supported by the National Natural Science Foundation of China (Granted No. 52073265).

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Authors and Affiliations

  1. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People’s Republic of China

    Tian-Yu Wang, Wei Yang, Hao-Hao Hui, Xiang-Yang Lei, Qing-Hua Zhang, Jian Wang, Qiao Xu & Xue-Ran Deng

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  1. Tian-Yu Wang
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  2. Wei Yang
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  3. Hao-Hao Hui
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  8. Xue-Ran Deng
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Correspondence to Qiao Xu or Xue-Ran Deng.

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Wang, TY., Yang, W., Hui, HH. et al. Preparation of polysiloxane coating for laser application with improved curing property based on copolymerization modification. J Coat Technol Res 19, 1233–1241 (2022). https://doi.org/10.1007/s11998-021-00605-7

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  • DOI: https://doi.org/10.1007/s11998-021-00605-7

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