Abstract
High resolution absorption and emission spectra of Cr4+ doped Y3Al5O12 are presented. Angular overlap model calculations for the determination of the energy level scheme of the Cr4+ : YAG system are presented. Group-theoretical considerations according to the crystal structure and the symmetry of the tetrahedrally co-ordinated Cr4+ lattice site are presented to explain the observed dependence of the emission spectra on the direction of polarization.
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