Abstract

We have demonstrated 1.15 W of Gaussianlike (M2 = 2) cw output at 2.94 µm from a diode laser end-pumped monolithic laser crystal composed of Er-doped yttrium aluminum garnet (YAG) bonded to undoped YAG. The laser was pumped with two polarization-coupled 2.5-W flared laser diodes that provided a 45-µm pump waist with a low N.A. (<0.04). Output at 2.94 µm was generated with a 34% slope efficiency and a greater-than-unity quantum efficiency.

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