Abstract
Periodic microlens arrays (MLAs) produce interference lattices when homogenizing highly coherent beams. We propose an aperiodic combined microlens array (CMLA) comprising seamlessly tiled multiscale sub-lenses with a constant F-number and 100% fill factor. Aperiodic displacements and aperture diversity disrupt phase matching and redistribute interference energy in the spatial-frequency domain. Experiments show a rectangular flat-top beam with a uniformity of 86.2%, modulation depth of 0.220, and spectral disorder index of 0.844, outperforming periodic MLAs. The CMLA offers a compact, passive route to coherent-beam homogenization.