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Proceedings Paper

Pairs and nonequivalent Pr3+ sites in GGG
Author(s): Aurelia Lupei; H. Gross; Peter Reiche
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Paper Abstract

Spectral data on Pr3+ ion in Czochralski grown GGG Gd3Ga5O12) crystals are analyzed. Pr3+ spectra, investigated by high resolution absorption, site selective excitation and emission contain besides the main lines assigned to Pr3+ in dodecahedral c-sites, at least four other types of non-equivalent centers. Three satellites have been assigned to Pr3+ in dodecahedral c-sites perturbed by a non-stoichiometric defect, Gd3+ in octahedral sites, whose concentration was estimated from absorption. A reduction of local symmetry is observed from the spectra. It is connected with X-ray measurements that show forbidden {222} reflections in cubic ideal garnets, but with similar small intensities. Other lines are assigned to Pr3+(c)- Pr3+(c) near pairs, one of them showing a very strong quenching of 3P0 emission. Some of the mechanisms of 3P0 emission quenching and their influence on quantum efficiency are discussed.

Paper Details

Date Published: 11 April 1996
PDF: 10 pages
Proc. SPIE 2772, Laser Optics '95: Solid State Lasers, (11 April 1996); doi: 10.1117/12.238090
Show Author Affiliations
Aurelia Lupei, Institute of Atomic Physics (Romania)
H. Gross, Technical Univ. of Darmstadt (Germany)
Peter Reiche, Institute for Crystal Growing (Germany)


Published in SPIE Proceedings Vol. 2772:
Laser Optics '95: Solid State Lasers
Artur A. Mak; Vladimir I. Ustugov, Editor(s)

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