Abstract
This study aims to demonstrate the effectiveness of sets of microlens arrays to homogenize and finely shape focal spots, for optimizing optical pumps of interest for Yb-doped slabs in the field of high-power lasers, or for use in materials processing and industrial applications. Homogenization basically involves optical integration in the Fourier plane of a large focusing lens, the input light source being consistently sampled. The generic capabilities of three complementary optical designs are demonstrated thanks to combining transfer-matrix computations with highly resolved ray-tracing modeling. This helps to benchmark a variety of experimental results. Fully generic trends are evidenced in terms of the shaping capabilities, for highly efficient focusing, in the form either of a single spot or of multiple sub-spots. Peak power densities as elevated as some hundreds of kW/cm2 or a few MW/cm2, respectively, may be produced by a couple of multi-kilowatt diode stacks.
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