Anisotropic magneto-optical properties of vanadium in Bi4Ge3O12

The paper deals with the investigation of the magneto-optical effect and photochromism in vanadium doped Bi4Ge3O12 (BGO) single crystals in a wide spectral range. It has been found out that the photosensitivity of doped crystals is significantly shifted to the visible wavelengths. This investigation reports the experimental results of Faraday rotation in the case of vanadium doped Bi4Ge3O12. The rotation angle of the polarization plane of the crystal plate has been investigated in the magnetic field in an illuminated state, obtained by exposure with ultraviolet (UV) light and an annealed state developed after annealing at 400°C. We have observed the strong appearance of vanadium impurity in the spectral range 380–700nm. The experimental determination of magneto-optical properties of V4+ ions gives us an opportunity for calculation of the refractive index n of the doped BGO.