Abstract
The two-photon spectra of the isoelectronic d3 ions Cr3+ and Mn4+ provide a new understanding of their spectral and photophysical properties not obtainable from the one-photon spectra. Using host crystals having cubic sites for the impurity, Cs2GeF6 for Mn4+; K2LiGaF6 for Cr3+ produces the simplest possible spectra. The local environment of the metal ion is the same in these two crystal structures out to second neighbors. The spectra can be described by adding spinorbit coupling to the Tanabe-Sugano matrices, and by taking account of vibronic coupling, Jahn-Teller effects and lattice coupling. Host crystals having lower symmetry are also useful for adding an additional perturbation.
© 1992 Optical Society of America
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