Abstract
An investigation was made of the feasibility of sensitizing the luminescence of Er3+ ions by Ce3+ ions in YAG and gadolinium gallium garnet (GGG) crystals. Efficient nonradiative transfer of energy from Ce to Er was observed in the YAG matrix. No sensitization was observed in a GGG:Er:Ce crystal. Flashlamp pumping of a YAG:Er:Ce crystal (λ = 2.94 μm) yielded a free-running threshold of 52 J and a differential efficiency of 2.1%. Coactivation of GGG:Er crystals with Ce3+ ions can extend the pump spectrum into the ultraviolet and enhance the lasing efficiency.
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