Linear and non-linear optical study of fluorotellurite glasses as function of selected alkaline earth metals doped with Er^sup 3

A systematic characterization of optical and chemical properties of fluorotellurite glasses based on 70TeO2-5MxOy-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 (n2) and two photon absorption (β). Finally, using (n2) 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.