Abstract

We report on high power and efficient laser operation of low scattering loss Tm:Y<sub>2</sub>O<sub>3</sub> ceramic fabricated in house via coprecipitation process. The Tm<sup>3+</sup> ion is pumped directly to the upper energy level of the ~ 2 &mu;m laser transition (<sup>3</sup>F<sub>4</sub> &rarr; <sup>3</sup>H<sub>6</sub>) using a high power 1620 nm fiber Raman laser. With an optically polished but uncoated sample of 2 at.% doping, the laser generated 11.3 W of TEM<sub>00</sub> output power at ~2050 nm for ~19 W of absorbed pump power, corresponding to a slope efficiency of 74.4% with respect to absorbed pump power.

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