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Neodymium-doped Yttrium Lithium Fluoride (YLF) lasers have traditionally been power-limited by the rel atively low tensile strength of the crystal. When power-sca ling solid-state lasers, the choice of the gain med ia geometry, the doping level, and the pumping scheme is dictated by minimizing the impact of thermally induced stress. To date the slab architecture has been the most successful for scali ng the average-power of Nd:YLF lasers due to its fa vorable thermal management. However, for efficient high-radiance la ser action it is also necessary to have a good over lap between the cavity mode and the planar gain volume. We present the performance characteristics for an end-pumped s lab-laser utilizing a stable low-loss resonator configuration that transforms a circular cavity mode at the outp ut coupler into a very high aspect ratio elliptical beam in the slab gain element to match the pumped volume. The optical arrangement for transforming the beam shape is also suitable for a double-pass slab amplifier configuration. A polarized CW output power of 50W, on the weaker Nd:YLF 1053nm transition was obtained with a single slab gain element and 110W of incident pump power from three spatially multiplexed diode bars. Laser thresh old was around 7W and the slope efficiency, with respect to incide nt power, 46%.

Circular output from a high power Nd:YLF slab laser