Abstract
We report on highly efficient operation of a Tm:YAG laser resonantly pumped (3H6→3F4) by an Er:YAG ceramic laser at 1617 nm. The lasing characteristics of 6 at.% Tm3+-doped Tm:YAG crystal were evaluated using output couplers of 6%, 10% and 20% transmission. A maximum continuous wave (cw) output power of 5.6 W at 2015 nm was obtained with a 10% transmission output coupler under 10.6 W of pump power, corresponding to a slope efficiency of 60.4% with respect to incident pump power.
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