Interaction of Er~(3+) ions in Er-doped calcium-niobium-gallium garnet crystals

摘要

The processes of nonradiative energy transfer in calcium-niobium-gallium garnet (CNGG) crystals doped with Er~(3+) ions are studied. It is found that the energy of erbium ions in the Er: CNGG crystal with the erbium atomic concentrations C_(Er) = 6% and 11% is transferred via the nonradiative co-operative processes ~4I_(11/2) →~4I _(15/2), ~4I_(11/2) → ~4F _(7/2); ~4I_(11/2)→~4I_(15/2), ~4I_(13/2)→~4F_(9/2); and ~4I~(13/2)→~4I15/2, ~4I ~(13/2) → ~4I_(9/2), wh0Se efficiency increases with increasing intensity of exciting radiation. It is shown that the crossrelaxation processes ~4S_(3/2) →~4I _(9/2), ~4I_(15/2) → ~4I _(13/2), whose intensity depends on the concentration of Er~(3+) ions, are characteristic for Er:CNGG crystals with the Er atomic concentration above 1 %.