Abstract

We have demonstrated 1.15??W of Gaussianlike M2=2 cw output at 2.94 ?m 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??m pump waist with a low N.A.??<0.04. Output at 2.94 ?m was generated with a 34% slope efficiency and a greater-than-unity quantum efficiency.

© 1999 Optical Society of America

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