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Proceedings Paper

Two-layer broadband antireflective coating prepared from methyl silicone and porous silica
Author(s): Ian M. Thomas
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Paper Abstract

Single layer quarterwave antireflective (AR) coatings are widely used on many of the transmissive optics in high power fusion lasers. With these coatings maximum efficiency is only obtained at one wavelength. In those applications involving harmonic converter crystals, however, broader band performance would be advantageous because light of two wavelengths is involved. A simple two layer broadband coating has been developed which consists of a layer of a methyl silicone polymer overcoated with porous silica. This is prepared from methyltriethoxysilane and tetraethyl silicate, respectively. Both reagents are distilled to the highest purity so that the coatings are non-absorptive and have the highest laser damage threshold. Less than 0.5% reflection over a broad wavelength range can be obtained on substrates in the 1.46 to 1.51 index range.

Paper Details

Date Published: 2 October 1997
PDF: 5 pages
Proc. SPIE 3136, Sol-Gel Optics IV, (2 October 1997); doi: 10.1117/12.284123
Show Author Affiliations
Ian M. Thomas, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 3136:
Sol-Gel Optics IV
Bruce S. Dunn; John D. Mackenzie; Edward J. A. Pope; Helmut K. Schmidt; Masayuki Yamane, Editor(s)

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