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We report on high power and narrow linewidth laser operation of home-developed high optical quality Tm:YAG ceramic. The Tm3&#x002B; ion is pumped directly to the upper energy level of the &#x223C; 2&#x00A0;&#x03BC;m laser transition (3F4 &#x2192; 3H6) using a high power 1620&#x00A0;nm fiber Raman laser. The laser generated 15.1&#x00A0;W of output at 2013&#x00A0;nm in free running for 27.4&#x00A0;W of absorbed pump power, corresponding to a slope efficiency of 64.0&#x0025; with respect to absorbed pump power. Employing a reflecting volume Bragg grating (VBG) as a resonator mirror and for spectrum control, the laser generated 11.8&#x00A0;W of 0.1&#x00A0;nm narrow linewidth output at 2015&#x00A0;nm for &#x223C;24&#x00A0;W of absorbed pump power, corresponding to a slope efficiency of 61.5&#x0025;.

High Power and Efficient Operation of Tm:YAG Ceramic Laser Resonantly Pumped at 1620 nm