Faraday rotation effect of highly Tb2O3/Dy2O3-concentrated B2O3-Ga2O3-SiO2-P2O5 glasses

A large amount of Tb2O3 and DY2O3 has successfully been incorporated into a borate glass with a molar composition of 5B(2)O(3)-3Ga(2)O(3)-3SiO(2)-P2O5. Raman scattering analysis revealed the existence of isolated orthborate (BO3)(3-) groups with increasing rare-earth content. The obtained glass exhibited an excellent Faraday rotation effect in the visible region The simultaneous incorporation of 40 mol % Tb2O3 and 10 mol % Dy2O3 offered the Verdet constant of as much as - 185.3 rad/(T x in) at 632.8 nm at 300 K.