Abstract
An efficient high power cw Nd:YAG slab laser, partially end pumped by diode laser stacks is described in this paper. With conventional stable resonator, the optical efficiency amounted to 44% and the slope efficiency 55%. The output beam with this resonator was rectangular and the beam quality asymmetric in two orthogonal planes. The symmetry of the beam quality was obtained by a step mirror beam shaping technique. By using a hybrid resonator, near diffraction limited beam quality in the unstable direction was obtained with an efficiency of 46%.
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