Determination of magneto-optical quality and refractive index of bismuth germanium oxide single crystals grown by Czochralski technique

摘要

Bi_(12)GeO_(20) single crystals were grown by the Czochralski technique. The critical diameter and the critical rate of rotation were calculated. Suitable polishing and etching solutions were determined. As a result of our experiments, the pale yellow and black single crystals were produced. The structure of the Bi_(12)GeO_(20) has been investigated by X-ray diffraction, Raman and IR spectroscopy. The atomic ratio Bi/Ge was determined for the both crystals. The refractive indexes of both Bi_(12)GeO_(20) crystals were determined by the spectroscopic ellipsometry method. Important properties of Bi_(12)GeO_(20) for sensing applications, optical activity, Faraday rotation and absorption were measured and magneto optical quality was calculated and compared.