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|Type:||Artigo de periódico|
|Title:||Preparation And Characterisation Of High Refractive Index Pbo-tio2-teo2 Glass Systems|
|Abstract:||We describe the preparation and characterisation of high refractive index PbO-TiO2-TeO2 glass systems. Highly homogeneous glasses were obtained by agitating the oxide mixture during the melting process in an alumina crucible. The characterisation was performed by X-ray diffraction, density, dilatometry, Raman scattering, light absorption and linear refractive index measurements. The results show a change in the glass structure as the PbO content increases: the TeO4 trigonal bipyramids characteristic of TeO2 glasses transform into TeO3 trigonal pyramids. However, the measured refractive indices are almost independent of the glass composition. We show that third-order non-linear optical susceptibilities calculated from the measured refractive indices using Lines' theoretical model are also independent of the glass composition.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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