We report on the experimental demonstration of a fiber laser array composed by 7-elements coherently combined to obtain a total power up to 10kW. The architecture is based on a narrow line single mode master oscillator whose emission is modulated to widen the linewidth up to 47 GHz. The large-linewidth seed is then split in multiple replicas that can be amplified up to 2kW each. Then, a hexagonal array of collimated laser beams is realized by means of a custom opto-mechanical tiled aperture structure. Finally, the beams are overlapped by means of an optical system and coherently combined controlling the single source phases through Lithium-Niobate phase modulators, whose correction signals are computed by a proprietary hill-climbing algorithm.
With the developed system it was possible to carry out a characterization campaign to evaluate the vulnerability of different targets, materials and surface finishes, together with the definition of the relevant damage assessment criteria. Some of the most notable results will be presented. The laser Facility, built for this purpose, where the demonstrator has been integrated and tested will be presented too.
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