Preparation and performance of magneto-optical glasses doped with Tb³⁺/Dy³⁺

Abstract

In order to increase the content of rare-earth oxides in magneto-optical glass and improve the Verdet constant, the rare-earth doped ternary Ga₂O₃-B₂O₃-SiO₂(GBS) system magneto-optical glasses were prepared by the melt quenching technique. The influence of Tb³⁺ and Dy³⁺ ions on the structure of GBS glasses was investigated using FTIR, DSC and Faraday rotations. The experimental results showed that the content of rare-earth oxides in the glasses with the double incorporation of Tb₂O₃ and Dy₂O₃ was higher. The crystallization parameter β achieved the maximum 0.48 with Tb³⁺/Dy³⁺ content of 35mol%. Terbium oxide existed mainly in [TbO₃] units in the glasses and [TbO₄] units were converted into [TbO₃] with increasing Tb₂O₃ content. As Ga³⁺ ion is larger than B³⁺ ion in radius, leading to an increasing of the glass network gap and improvement in the ability of accommodating rare earth ions, Verdet constant increased.

Keywords

magneto-optical glass / faraday rotation / rare earth oxide

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