Linear and non-linear refractive indices of tellurite glasses in the system TeO2–WO3–ZnF2

Glasses in the system TeO2–WO3–ZnF2 have been studied with respect to their densities, molar volume, refractive indices, polarizability, molar refraction and third-order non-linear optical susceptibility. The molar refraction, Rm, and the electronic polarizability, αO2−, of the (TeO2–WO3–ZnF2) have been estimated by the refractive indices at different wavelengths. The third-order non-linear optical susceptibilities, χ(3), were measured using degenerate four-wave mixing (DFWM). The value of the non-linear refractive index decreases with increasing ZnF2 – but increases with increasing WO3 concentration. Results obtained are discussed in terms of the glass structure.