Highly Dy₂O₃ and Er₂O₃ doped boron-aluminosilicate glasses for magneto-optical devices operating at 2 µm

Magneto-optical glass materials with large Verdet constants at 2 μm have attracted increasing attention due to the significant advances of novel lasers operating at this wavelength region. In this paper, 13Al₂O₃-21B₂O₃-35.4SiO₂-(30.6-X)Er₂O₃-XDy₂O₃ glasses have been synthesized, and their physical, optical, and magneto-optical properties were studied for making Faraday devices at 2 μm. A Verdet constant of as high as −5.9 rad/(T*m) at 1950 nm was measured with a 13Al₂O₃-21B₂O₃-35.4SiO₂-30.6Dy₂O₃ glass. The temperature difference between crystallization and glass transition of 150 °C and the synthesis temperature of below 1500 °С make this glass very promising for making magneto-optical devices for 2 μm applications.