Wavelength dependence of Tb 3+ doped magneto-optical glass Verdet constant

Magneto-optical glass is a category of optical materials. In this study, a series of Tb3+ doped Ga2O3–B2O3–SiO2–GeO2 (GBSG) glasses were prepared and studied. Through the density test, it was found that the structure of the magneto-optical glass tended to be dense. At the same time, the result of infrared spectrum shows that some changes happened to the structure of the sample with different Tb3 + concentration, resulting in the change of the density of the magneto-optical glass. The wavelength dependence of the Verdet constant has been studied. The results show that the rate of change of the Verdet constant at different wavelengths has nothing to do with the Tb3+ concentration, but only with the effective transition wavelength. The effective transition wavelength of the sample was calculated by the formula, and the source of the magneto-optical effect of the rare earth doped magneto-optical glass was confirmed.