Nonlinearity and photostructural changes in glassy As sub(2)S sub(3) thin films

Measurements are reported of the refractive index and absorption coefficient changes of amorphous As sub(2)S sub(3) (chalcogenide glass) thin films due to cw laser light irradiation. We have measured the transmittance through a thin film in the z-scan technique configuration. Two different contribut...

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Published inOptics communications Vol. 101; no. 1-2; pp. 74 - 78
Main Authors Michelotti, F, Fazio, E, Senesi, F, Bertolotti, M, Chumash, V, Andriesh, A
Format Journal Article
LanguageEnglish
Published 01.01.1993
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Summary:Measurements are reported of the refractive index and absorption coefficient changes of amorphous As sub(2)S sub(3) (chalcogenide glass) thin films due to cw laser light irradiation. We have measured the transmittance through a thin film in the z-scan technique configuration. Two different contributions to refractive index changes are demonstrated, showing the existence of a permanent and a dynamical effect. The first effect was demonstrated performing usual normal incidence transmittance measurements. The second dynamical change, revealed by the Z-scan technique, disappears once the light source is turned off: measured in the latter case is a maximum change of the refractive index Delta n = -8 x 10 super(-3) in the cw regime at lambda = 514.5 nm.
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ISSN:0030-4018