Investigation of the structural and magnetic properties of TeO2- based glasses modified by rare earth (La2O3, Gd2O3, Er2O3, and Ho2O3) using as an optical isolator

Tellurite glasses with a composition of 76TeO(2)-10ZnO-9PbO-1.0PbF(2)-3.0Nb(2)O(5)- 1.0 x in mol% modified with different rare earth oxides (where x= La2O3, Gd2O3, Er2O3, and Ho2O3). The magnetic properties such as; Faraday effect and the Verdet constant at the intensity of the laser beam (lambda = 632 nm) of the present glasses were measured. The glass contains La2O3 has the highest value of Verdet constant, (V = 0.102min/G.cm) otherwise the sample has Ho2O3 has the lowest value of Verdet constant (V = 0.069 min/G.cm). It means that V- value strongly depends on the polarizability of rare earth. An optical isolator is a unidirectional light gate, which can prevent the back reflection of light into lasers or optical amplifiers and reduce signal instability and noise. Finally, the structure of prepared glasses was investigated by Raman spectra.