^aResearch Center for Advanced Materials Science (RCAMS), King Khalid

University, Postcode: 9004, Zip code: 61413, Abha, Saudi Arabia

^bDepartment of Radiological Sciences, College ofApplied Medical Sciences, King Khalid University, Abha 61421, Saudi Arabia

^cDepartment of Medical Physics and Instrumentation, National Cancer Institute, University of Gezira, Wad Medani 2667, Sudan

^dPhysics Department, Faculty of Science, King Khalid University, Postcode: 9004, Zip code: 61413, Abha, Saudi Arabia

e BioImaging Unit, Space Research Centre, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK

^fFaculty of Materials Science and Ceramics, AGH – University of Science and

Technology, al. Mickiewicza 30, 30-059 Cracow, Poland

The novel glasses within composition: 62TeO2-5K2TeO3-20ZnO- 10Nb2O5-3PbF2 and 62TeO2-5K2TeO3-20ZnO- 10Nb2O5-3PbF2-2Er2O3 in mol% were fabricated by using melt- quenching technique. The magnetic properties Viz; Faraday effect and the Verdet constant at wavelength of laser beam (λ = 632 nm) were measured. The prepared sample with doped Er3+ has the highest value of Verdet constant (= 0.104min/G.cm) which depends on the polarizability of Er3+ ions. Moreover, the optical properties of present glass estimated by using UV-Vis-NIR spectroscopy. The oxygen-packed densities, molar volumes, the polarizability of the oxygen molar volume, the linear refractive index (n), third-order nonlinear susceptibility, x(3) , and nonlinear index (n2) of produced glasses were

evaluation. It was found that the linear refractive index decreases otherwise the optical energy gap increased with doped Er3+ ions in the glasses network. Also, the Vickers microhardness increase with increasing Er2O3 in the glass matrix. Hence, these glasses may be use in optical isolator with high third-order non-linear susceptibility.