Abstract
Nd:LuAG transparent ceramics were fabricated by a solid-state reaction method using commercial high-purity oxide powders as raw materials. The microstructure, optical transmittance, fluorescence spectrum and laser performance of 0.8 at.% Nd:LuAG transparent ceramics were investigated. It is found that the relative density and grain size for Nd:LuAG ceramics increase with the increase of sintering temperature. The specimen sintered at 1830°C for 30h is dense and homogeneous in structure with an average grain size of about 39.6μm, whose in-line transmittances are 82.8% at 1064nm and 81.8% at 400nm. The main fluorescence emission peak is centered at about 1063.5nm and the fluorescence lifetime is 240μs. The optimum laser properties are obtained with the 300μm pumping beam and 25% output coupler, corresponding to a slope efficiency of 43.4% and an optical–optical efficiency of 39.3%. In addition, the depolarization caused by the thermally-induced birefringence was also investigated.
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