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We present for the first time a high-power Ho:YAG laser in-band pumped by a (AlGaIn)(AsSb) laser diode stack with 1910 nm centre wavelength. Using a single 60 mm long Ho:YAG rod in a simple and compact plane-plane resonator geometry a maximum laser output power of 40 W and a slope efficiency of 57% with respect to the absorbed pump power were obtained. A beam quality of M2 < 4 was found.
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