High Power Single Frequency Tm:Y2O3 Ceramic Laser at 2015 nm

We report on high power, single-frequency operation of a compact Tm:Y ₂ O ₃ ceramic laser in 2 μm spectral region employing a volume Bragg grating in a simple linear resonator to serve simultaneously as a resonator mirror and mode selector. The home developed laser quality Tm:Y ₂ O ₃ ceramic sample has a Tm doped concentration of 2 at.% and pumped with a fiber coupled 793 nm laser diode. Up to 1.5 W of CW single frequency output power at 2014.9 nm has been generated, corresponding to a slope efficiency of 37.9% with respect to absorbed pump power. M ² factor of the output beam was measured to be ∼1.03.