A rapid energy transfer from the Gd3+ ions to the Cr3+ ions in the chromium doped gadolinium garnets GSGG, GSAG and GGG has been investigated. The process is characterized by a rapid energy migration on the Gd sublattice and a rate limiting Gd3+ ➝ Cr3+ step. The nonexponential Cr3+ decay kinetics are interpreted in terms of the structural disorder of the garnets.

© 1989 Optical Society of America

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