10 kW wide-linewidth coherent beam combination in tiled-aperture configuration at Leonardo Laser Facility

Fabrizio Bisesto; Alessandro Perna; Valentina Sacchieri; Federica Auletta; Francesco Ancona; Simone Tacchini; Alberto Cosentino

doi:10.1117/12.3003667

23 October 2023 10 kW wide-linewidth coherent beam combination in tiled-aperture configuration at Leonardo Laser Facility

Fabrizio Bisesto, Alessandro Perna, Valentina Sacchieri, Federica Auletta, Francesco Ancona, Simone Tacchini, Alberto Cosentino

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Proceedings Volume PC12739, High Power Lasers: Technology and Systems, Platforms, Effects VI; PC1273905 (2023) https://doi.org/10.1117/12.3003667
Event: SPIE Security + Defence, 2023, Amsterdam, Netherlands

Abstract

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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Fabrizio Bisesto, Alessandro Perna, Valentina Sacchieri, Federica Auletta, Francesco Ancona, Simone Tacchini, and Alberto Cosentino "10 kW wide-linewidth coherent beam combination in tiled-aperture configuration at Leonardo Laser Facility", Proc. SPIE PC12739, High Power Lasers: Technology and Systems, Platforms, Effects VI, PC1273905 (23 October 2023); https://doi.org/10.1117/12.3003667

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KEYWORDS

Coherent beam combination

Collimation

Detection and tracking algorithms

Fiber lasers

Modulation

Optical coherence

Oscillators

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