Abstract
Tellurite glasses with composition 75TeO(2)-5WO(3)-15Nb(2)O(5)-5M(x)O(y) in mol%, where MxOy = (Na2O, Ag2O, ZnO, MgO, CuO, NiO, TiO2, MnO2) have been prepared by using the conventional melt-quenching method. Thermal characteristic of prepared glasses were investigated by using DTA techniques. It was found that the glass with the composition 751TeO(2)-5WO(3)-15Nb(2)O(5)-5TiO(2) had high thermal stability (Delta T = 122 degrees C at heating rate 15 K/min). Raman gain coefficients and bandwidths of prepared glasses for Raman gain media were evaluated. The glass with composition 75TeO(2)-5WO(3)-15Nb(2)O(5)-5Na(2)O had the maximum value of Raman gain coefficient (g = 4.43 x 10(-12) m/W) and it was 24 times as large as silica glass. The highest value of full width half maximum (FWHM approximate to 185 cm(-1)) was observed in glass system 75TeO(2)-5WO(3)-15Nb(2)O(5)-5NiO. Finally, the structure of the glasses was investigated through deconvolution Raman and IR spectra. (C) 2014 Elsevier Masson SAS. All rights reserved.