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Optical Engineering

Front and back illumination of coated substrates for in-depth localization of absorption
Author(s): Ludovic Escoubas; Pierre J. Roche; Mireille Commandre
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Paper Abstract

We experimentally demonstrate that part of the absorptance of coated multicomponent glass substrates results from a photoinduced absorptance of the substrate during the evaporation process. This increase in the glass substrate absorptance is due to a solarization process by UV radiation, which is produced in the coating plant when electrons emitted by the electron gun interact with the material to be evaporated. Thus, we can experimentally show the dependence of the multicomponent glass substrate absorptance on the evaporation time. An original method of front and back illumination of samples is presented that enables the separation of each part of the in-depth absorptance using photothermal measurements: bulk and interface absorption of the thin film and substrate photoinduced absorption. This new method overcomes the difficulties presented by other measurement techniques and caused by the dependence of substrate and interface absorptances on the evaporation time. Absorption losses in different single-layer films are balanced.

Paper Details

Date Published: 1 April 1997
PDF: 8 pages
Opt. Eng. 36(4) doi: 10.1117/1.601239
Published in: Optical Engineering Volume 36, Issue 4
Show Author Affiliations
Ludovic Escoubas, Ecole Nationale Superieure de Physique d (France)
Pierre J. Roche, Ecole Nationale Superieure de Physique de Marseille (France)
Mireille Commandre, Ecole Nationale Superieure de Physique de Marseill (France)

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