Linear and non-linear optical study of fluorotellurite glasses as function of selected alkaline earth metals doped with Er3+

A systematic characterization of optical and chemical properties of fluorotellurite glasses based on 70TeO2-5 M x O y -10P2O5-10ZnO-5PbF2 glasses as function of alkaline earth metals as network modifiers were studied and analysed. The Z-scan results show that all the compounds have NLO properties such as nonlinear refractive index ( n 2 ) and two photon absorption ( β ). Finally, using ( n 2 ) and ( β ) we also determined the third-order nonlinear optical susceptibility χ 〈 3 〉 . It was found that the alkaline earth metals elements, have an influence on such NLO properties. Based on the ability of the lattice modifiers to decrease the band-gap energy while simultaneously increasing the linear refractive index of the TeO2-based glass, we investigated how these modifiers affect the non-linear refractive index.