Wavelength dependence of Verdet constant of Tb³⁺:Y₂O₃ ceramics

Samples of the magneto-active material—Tb³⁺:Y₂O₃ ceramics with Tb³⁺ ion concentrations of 10%, 20%, 30%, and 100% (Tb₂O₃)—were prepared and studied. The wavelength dependence of Verdet constant in the 380 nm–1750 nm range was approximated for all investigated ceramic samples and was predicted for a pure Tb₂O₃ material. Tb₂O₃ ceramics demonstrates a more than three times higher Verdet constant in comparison with terbium gallium garnet crystal or ceramics. The linear dependence of the Verdet constant on Tb³⁺ ion concentration in the Tb³⁺:Y₂O₃ ceramics was demonstrated. The obtained data will be useful for fabricating magneto-optical elements of Faraday devices based on Tb³⁺:Y₂O₃ with arbitrary Tb³⁺ ion concentration operating at room temperature in the wavelength range of 380 nm–1750 nm.