Refractive index changes in photochromic SbPO4-WO3 glass by exposure to band-gap radiation
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Data
2010-10-01
Autores
Ahlawat, Meenu
Vazquez, Gloria V.
Nalin, Marcelo [UNESP]
Messaddeq, Younes [UNESP]
Ribeiro, Sidney [UNESP]
Kashyap, Raman
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Editor
Elsevier B.V.
Resumo
We report photoinduced photo-darkening in SbPO4-WO3 glass by exposure to 532 nm light with a power density of 143 mW/cm(2). The time of exposure was varied between 0 and 256 min following which visible photo-darkening, peaking at 850 nm was observed. Spectrophotometer measurement of absorption was performed for both treated and untreated regions of the sample. Time exposure to below band-gap light results in a single exponent Gaussian absorption function over an exceptionally wide range of wavelengths (500 nm-1600 nm), with a 1/e width of 647.5 nm. Kramers-Kronig transform of the change in the absorption indicates a negative local change in the refractive index. The dispersed refractive index change at 1550 nm, Delta n, is calculated to be similar to -5 x 10(-8). The peak absorption increases with time of exposure and the photo-darkening remains irreversible at room temperature. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
Descrição
Palavras-chave
Photoinduced effects, Refractive index, Kramers-Kronig, Antimony
Como citar
Journal of Non-crystalline Solids. Amsterdam: Elsevier B.V., v. 356, n. 44-49, p. 2360-2362, 2010.