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Communication Dans Un Congrès Année : 2020

Coherent beam combining of 60 femtosecond fiber amplifiers

Résumé

We report on the first coherent beam combining of 60 fiber chirped-pulse amplifiers in a tiled-aperture configuration along with an interferometric phase measurement technique. Relying on coherent beams recombination in the far field, this technique appears well suited for the combination of a large number of fiber amplifiers. The 60 output beams are stacked in a hexagonal arrangement and collimated through a high fill factor hexagonal microlens array. The measured residual errors within the fiber array yields standard deviations of 4.2 μm for the fiber pitch and 3.1 mrad for the beam-to-beam pointing, allowing a combining efficiency of 50 %. The phasing of 60 fiber amplifiers demonstrates both pulse synchronization and phase stabilization with a residual phase error as low as lambda/100 RMS.
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Dates et versions

hal-03014035 , version 1 (19-11-2020)

Identifiants

  • HAL Id : hal-03014035 , version 1

Citer

Ihsan Fsaifes, Louis Daniault, Séverine Bellanger, Matthieu Veinhard, Jérôme Bourderionnet, et al.. Coherent beam combining of 60 femtosecond fiber amplifiers. Photonics West, Feb 2020, san francisco, United States. ⟨hal-03014035⟩
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