Study On The Preparation And Properties Of Germanium-lead Borosilicate Magneto-optical Glass

Magneto-optical glass has the advantages of simple preparation,good optical performance,flexible formula,has been widely used in optical systems such as magneto-optical function devices and fiber optic integrated equipment.In this thesis,a high-temperature melting method is used to prepare magneto-optical glass based on germanium lead borosilicate,and studied the structural characteristics,physical characteristics,magneto-optical characteristics and luminescence characteristics of the Tb³⁺single-doped,Tb³⁺-Dy³⁺co-doped Ge O₂-Pb O-B₂O₃-Si O₂（GPbBS）,Ge O₂-Pb O-B₂O₃-Si O₂-P₂O₅（GPbBSP）and Ge O₂-B₂O₃-Si O₂-P₂O₅（GBSP）magneto-optical glass.The research results are as follows:In Tb³⁺single-doped GPbBS and GPbBSP magneto-optical glass,density,Tb³⁺effective doping concentration,refractive index,theoretical optical basicity,and oxygen ion polarizability are all proportional to the Tb³⁺content,and GPbBS has good thermal stability,strong water resistance and alkali resistance,when the doping amount of Tb³⁺is 40 mol%,the Verdet constant reaches a higher value at different wavelengths,and the Verdet constant is-157.66 rad/（T·m）at the wavelength of incident light 633 nm.In Tb³⁺-Dy³⁺co-doped GPbBS and GPbBSP magneto-optical glass with stationary Tb³⁺ions concentration and changing Dy³⁺concentration,their physical properties are excellent,but the incorporation of high concentration Dy³⁺does not increase the luminous intensity of the glass,instead weaken its luminous intensity.When the incident light wavelength is 633 nm,the Tb³⁺doping concentration is 30 mol%,and the Dy³⁺doping concentration reaches 8 mol%,the Verdet constant of GPbBS glass is-162.90 rad/（T·m）.The Verdet constant of GPbBSP glass with Tb³⁺doping concentration of 30 mol%and Dy³⁺doping concentration of 18 mol%reached-165.69 rad/（T·m）,indicating that the incorporation of Dy³⁺improved the magneto-optical properties of the glass.