Abstract

The light losses have been studied in composites of glass with a single- or double-layer coating of composition SiO₂ and/or TiO₂ obtained by sol–gel technology. The measured absorption of the composite always differs from the theoretically calculated value as a consequence of the inhomogeneity and the different degree of porosity of the nanosize film and the diffusion of oxides from the substrate. The barrier properties of the SiO₂ layer in double-layer composites largely depend on the rheological characteristics of the film-forming solution and the deposition regime.

© 2014 Optical Society of America

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