Abstract
Er/Tm/Pr tri-doped yttrium lanthanum oxide transparent ceramics were fabricated by conventional ceramics processing. Their microstructures and spectroscopic properties were investigated. The energy transfer mechanism between Tm3+, Pr3+ and Er3+ was also discussed. The Er/Tm/Pr:(Y0.9La0.1)2O3 ceramics display a dense structure with no pores and uniform grains of about 40μm. The results shows that population inversion between the 4I11/2 and 4I13/2 level of Er:(Y0.9La0.1)2O3 transparent ceramics is enhanced by co-doping Tm3+ and low amount of Pr3+ (0.5at.%). When concentration of Pr3+ ions is high (2at.%), 2.7μm emission is restrained significantly due to the concentration quenching of Pr3+ ions. This Er/Tm/Pr tri-doped yttrium lanthanum oxide transparent ceramics can be considered as a promising material for mid-infrared lasers.
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