Abstract

Laser operation was achieved in microstructured channel waveguides of KY(WO<sup>4</sup>)<sup>2</sup>:Gd<sup>3+</sup>, Lu<sup>3+</sup>, Yb<sup>3+</sup>, resulting in a threshold of only 5 mW, a slope efficiency of 62% versus launched pump power, and 76 mW output power.

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