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Proceedings Paper

Recent developments in silica sol-gel antireflection (AR) coatings
Author(s): Paul A. Sermon; Mariana S. W. Vong; Nicholas J. Bazin; Rita Badheka; D. M. Spriggs
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Paper Abstract

Silica sol-gel anti-reflective (AR) coatings have been investigated with particular reference to their laser induced damage threshold (LIDT) when subjected to irradiation from a Nd pulse laser at 1064 nm. Coatings (whose thickness was optimized for minimum reflection at 1064 nm) were deposited by spinning silica sols (average particle size 15 nm) formed by the base (ammonium hydroxide) catalyzed hydrolysis/condensation of TEOS in ethanol. Addition of polyethyleneglycols (PEGs) increased the size of the colloidal silica particles and also induced some particle aggregation in the sol, unlike a similar chain length diol. Increases in the LIDT of the coatings possibly depend upon the impurity levels, the wettability of the substrate, and the presence of PEG. LIDT improvements may be obtained by control of substrate and coating surface wettability, hydrophilicity, and surface chemistry.

Paper Details

Date Published: 8 December 1995
PDF: 11 pages
Proc. SPIE 2633, Solid State Lasers for Application to Inertial Confinement Fusion (ICF), (8 December 1995); doi: 10.1117/12.228295
Show Author Affiliations
Paul A. Sermon, Brunel Univ. (United Kingdom)
Mariana S. W. Vong, Brunel Univ. (United Kingdom)
Nicholas J. Bazin, Brunel Univ. (United Kingdom)
Rita Badheka, Brunel Univ. (United Kingdom)
D. M. Spriggs, Atomic Weapons Research Establishment (United Kingdom)


Published in SPIE Proceedings Vol. 2633:
Solid State Lasers for Application to Inertial Confinement Fusion (ICF)
Michel Andre; Howard T. Powell, Editor(s)

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