We have demonstrated 1.15 W of Gaussianlike (M<sup>2</sup> = 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.
© 1999 Optical Society of America
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.3460) Lasers and laser optics : Lasers
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3500) Lasers and laser optics : Lasers, erbium
(140.3580) Lasers and laser optics : Lasers, solid-state
Da-Wun Chen, Curt L. Fincher, Todd S. Rose, Frank L. Vernon, and Renny A. Fields, "Diode-pumped 1-W continuous-wave Er:YAG 3-μm laser," Opt. Lett. 24, 385-387 (1999)