We report on the high-power and high-efficiency operation of a polycrystalline Ho:YAG ceramic laser in-band pumped by a Tm fiber laser at . Lasing characteristics of a and a -doped YAG ceramic were investigated and compared. Using an output coupler of 6% transmission, over of cw output power at has been generated with the doped Ho:YAG ceramic under of incident pump power, corresponding to an average slope efficiency with respect to the incident pump power of 63.6% and an optical-to-optical conversion efficiency of 61.1%.
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