Formation and magneto-optical properties of Tb2O3-doped Gallium Borate glass

Rare-earth-doped glass, prized for its transparency and high Verdet constant, holds promise in sensing and laser systems. However, the magneto-optical (MO) properties and glass structure can be influenced by the concentration of rare-earth ions and substrate doping. Here, we synthesized xB ₂O ₃- yGa ₂O ₃- zTb ₂O ₃ ( x + y + z = 100) MO glass, aiming to analyze the optimal ratio of Tb ions to the substrate by adjusting the glass composition. The Verdet constant for the 35mol% Tb ₂O ₃ glass peaks at -128.958 rad/(T⋅m) at 532 nm and -11.579 rad/(T⋅m) at 1550 nm. Our findings revealed that an increase in B ₂O ₃ led to a proportional increase in the Verdet constant, with the high sensitivity of magnetic field measurement reaching 0.206 rad/T. This result underscores the potential for tailoring glass compositions to optimize magneto-optical characteristics, and will contribute to the broader application of MO glasses in magnetic sensing and laser systems.