In this paper, some results on visible luminescence performed on Yb 3+ -doped gadolinium gallium garnets under 165 and 940 nm excitation were presented. The upconversion luminescence was ascribed to Yb 3+ cooperative luminescence and the presence of rare earth impurity ions. The gain cross-sections of Yb:GGG crystal as a function of excited-state population fraction β were studied. Emission spectra under 165 nm at 20 K showed there was no charge transfer luminescence in Yb:GGG.
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