Effects of Al2O3 on the thermal stability, glass configuration of Yb3Â +-doped TeO2-K2O-ZnO-Al2O3 based tellurite laser glasses

► We explored a novel tellurite glass with larger thermal stability than reported tellurite glasses; ► The investigated tellurite glass has potential use for GG-IAG fiber preparation. ► Interrelations are established between the thermal stability and glass structural polyhedron.