Czochralski growth and optical spectral properties of GInGG : Cr3+ single crystal

GInGG: Cr3+ crystal was grown by the Czochralski technique for the first time. The Optical absorption and fluorescence spectra were measured at room temperature and 77 K. Two wide absorption bands occur at 457 and 643nm. A highly efficient emission from 670-1050nm with a peak at 771nm was observed at 289K. The energy levels were fitted by means of Tanabe-Sugano matrices and the values of Dq, B and C were calculated to be 1555, 637 and 3226 cm(-1), respectively.