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The structure of glasses of the compositions xEr2O3-2 xTiO2-(100-3 x )TeO2 was investigated and the glass formation region, situated in the range of 2 < x < 7 was established. The possibility of increasing the glass transition temperature and consequently the thermal stability of erbium tellurite glass by doping with titanium (IV) oxide was demonstrated. [ABSTRACT FROM AUTHOR]

The first nonlinear optic nanocomposite based on a low-melting vitreous matrix and a ferrielectric crystal has been obtained. The matrix consists of lead-borate glass and the filler is single-phase powder of ferrielectric KNbSi2O7. The quadratic optical nonlinearity of composites was studied depending on temperature and time of dissolution of crystals in the glass matrix. Conditions for producing transparent nanocomposites that generate the second optic harmonic are identified. [ABSTRACT FROM AUTHOR]

Abstract: Ti–Al co-doped erbium tellurite glasses have been obtained by melting mixed Er2O3, TiO2 and TeO2 batches in Al2O3 crucibles. By crucible dissolution Al2O3 amounts from 11.5 to 18.6mol% were introduced in the synthesized glasses. Differential thermal analysis of glasses points to a strong dependence of glass transition temperature T g with the substitution extent of TeO2 by the doping oxides. No crystallization features are observed up to 450°C. The spectral features and decay kinetics of the infrared photoluminescence of erbium demonstrate the possibility to achieve more than 50% of quantum yield of light-emission at Er3+ concentrations as large as 1021 cm−3, with about 2ms of lifetime, 8×10−21 cm2 of stimulated emission cross section, and no saturation at pump power densities higher than 10kWcm−2. The study of the kinetics of Er–Er energy transfer suggests to ascribe these features to a particularly homogeneous dispersion of Er3+ ions in the modified tellurite network. Raman scattering measurements of the spectral distribution of vibrational modes evidence that the introduction of doping oxides leads to an increase of structural disorder without crystallization effects. [Copyright &y& Elsevier]