Abstract
The processes of nonradiative energy transfer in calcium — niobium — gallium garnet (CNGG) crystals doped with Er3+ ions are studied. It is found that the energy of erbium ions in the Er:CNGG crystal with the erbium atomic concentrations CEr=6% and 11% is transferred via the nonradiative co-operative processes 4I11/2→ 4I15/2, 4I11/2→ 4F7/2, 4I11/2→ 4I15/2, 4I13/2→ 4F9/2; and 4I13/2→ 4I15/2, 4I13/2→ 4I9/2, whose efficiency increases with increasing intensity of exciting radiation. It is shown that the cross-relaxation processes 4S3/2→4I9/2, 4I15/2→4I13/2, whose intensity depends on the concentration of Er3+ ions, are characteristic for Er:CNGG crystals with the Er atomic concentration above 1%.
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