Abstract
Both Yb:YAG and Yb:LuAG transparent ceramics were fabricated by vacuum sintering technology. Phase identification, surface morphologies and laser characteristics were comparatively investigated. For the optical transmittance spectrum of pre-annealing samples, absorption peaks of Yb:LuAG show a large blue shift in the visible region compared with that of Yb:YAG ceramics. The emission intensity gradually decreases with the rise of temperature. The fitting result of fluorescence decay curve shows the lifetimes of Yb3+ ions at 1030nm to be 1.23ms for Yb:YAG and 1.50ms for Yb:LuAG ceramics. Pumped by a 970nm diode laser, the slop efficiency was 33% for 5.0at.% Yb:LuAG ceramic with the maximum laser output of 881mW at the absorbed pump power of 3.3W. By comparison, the slope efficiency of 24% was achieved for 5.0at% Yb:YAG transparent ceramic.
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