Wavelength dependence of Verdet constant of Pr doped terbium gallium garnet crystal

Abstract Samples of the magneto-active material – Pr 3+ : Tb 3 Ga 5 O 12 crystals with Pr 3+ ion concentration of 1%, 2%, 3% and 5%. The Verdet constant measurement has been carried out at room temperature in the 400–1500 nm range for all crystal samples and was compared with a pure Tb 3 Ga 5 O 12 material. A high value of the Verdet constant for 5% Pr 3+ : Tb 3 Ga 5 O 12 crystal was obtained at room temperature – namely, 324.5, 200.1 and 68.7 rad/(T·m) for 532, 632.8 and 1064 nm, respectively. The Verdet constant of Pr doped TGG crystal at 1064 nm is much more higher than that of TGG. The superior performance of the materials indicates that Pr 3+ : Tb 3 Ga 5 O 12 crystals have great potential to meet the increasing demand for magneto-optical devices in the VIS-NIR wavelength.