Coherent beam combining of 60 femtosecond fiber amplifiers

Ihsan Fsaifes; Louis Daniault; Séverine Bellanger; Matthieu Veinhard; Jérôme Bourderionnet; Christian Larat; Eric Lallier; Eric Durand; Arnaud Brignon; Jean-Christophe Chanteloup

doi:10.1117/12.2545229

21 February 2020 Coherent beam combining of 60 femtosecond fiber amplifiers

Ihsan Fsaifes, Louis Daniault, Séverine Bellanger, Matthieu Veinhard, Jérôme Bourderionnet, Christian Larat, Eric Lallier, Eric Durand, Arnaud Brignon, Jean-Christophe Chanteloup

Author Affiliations +

Proceedings Volume 11260, Fiber Lasers XVII: Technology and Systems; 112600L (2020) https://doi.org/10.1117/12.2545229
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

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 λ/100 RMS.

Citation Download Citation

Ihsan Fsaifes, Louis Daniault, Séverine Bellanger, Matthieu Veinhard, Jérôme Bourderionnet, Christian Larat, Eric Lallier, Eric Durand, Arnaud Brignon, and Jean-Christophe Chanteloup "Coherent beam combining of 60 femtosecond fiber amplifiers", Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 112600L (21 February 2020); https://doi.org/10.1117/12.2545229

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