Abstract

We demonstrate efficient laser operation using a ${\rm Ho}:{{\rm Y}_2}{{\rm O}_3}$ ceramic with low scattering loss and excellent optical quality fabricated in-house through an improved technique in support of high-power laser operation. The ${\rm Ho}:{{\rm Y}_2}{{\rm O}_3}$ ceramic laser was in-band pumped by a Tm-fiber laser of 1931 nm at room temperature. With an optically polished but uncoated sample of 0.5 at. % ${{\rm Ho}^{3 + }}$ doping, up to 113.6 W continuous-wave output power at 2117 nm has been generated with a slope efficiency of 55.6% with respect to the absorbed pump power. To the best of our knowledge, this is the highest output power achieved with a Ho-doped ceramic.

© 2019 Optical Society of America

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