__________________________________________________________________________________________ Tellurite glass is a promising material for laser applications and non-linear optics. The measurement of the refractive index is a part of the physical properties determination that is important for estimating the optical properties of glass laser. This research determined and analyzed the refractive index of tellurite-based glass TBZP dopedNd3+fabricated by melt quenching technique with composition 55TeO2-2Bi2O3-(38-x) ZnO-5PbO-xNd2O3(mol%)(x=0,5; 1; 1,5; 2; 2,5). The refractive index of glass was measured by the brewster angle method on tranverse magnetic mode (TM). On the TM mode it could be determined the brewster angle and minimum reflectance value of the glass. The results showed high refractive index of fabricated glassTBZP doped by Nd3+increasing from 1.825 to 2.081 with increasing concentrations of modifier Nd2O3from 0,5 %mol to 2,5 %mol. The addition of cations on the network structure of the glass affected to the glass structure which lead to a local change of the distribution of Bridging Oxygen (BO) and Non Bridging Oxygen (NBO) bond. The addition of Nd3+ concentration caused an increasing of the value of the parameters of physical properties such as molar mass, density, molar volume, and molar refraction.
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