Magneto-optical properties of highly Dy³⁺ doped multicomponent glasses

Due to their large effective magnetic moment, Dy³⁺-doped materials have attracted much interest for magneto-optical applications. In this paper, we report highly Dy³⁺ doped multicomponent glasses with concentrations from 40 wt.% to 75 wt.% and their magneto-optical properties. A Verdet constant of -7.4 rad/T/m at 1950 nm was measured with the 75 wt.% Dy³⁺-doped glass. This is the highest reported Verdet constant around 2 µm for a paramagnetic glass. Our experimental results show that highly Dy³⁺-doped glasses are promising isotropic magneto-optical materials for applications in the 2 µm wavelength region.