Coherent beam combining of 61 femtosecond fiber amplifiers Article Swipe

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Ihsan Fsaifes , Louis Daniault , Séverine Bellanger , Matthieu Veinhard , Jérôme Bourderionnet , Christian Larat , É. Lallier , Éric Durand , A. Brignon , Jean-Christophe Chanteloup ·

YOU? · · 2020 · Open Access · · DOI: https://doi.org/10.1364/oe.394031 · OA: W3029676948

We report on the coherent beam combining of 61 femtosecond fiber chirped-pulse amplifiers in a tiled-aperture configuration along with an interferometric phase measurement technique. Relying on coherent beam recombination in the far field, this technique appears suitable for the combination of a large number of fiber amplifiers. The 61 output beams are stacked in a hexagonal arrangement and collimated through a high fill factor hexagonal micro-lens array. The residual phase error between two fibers is as low as λ/90 RMS, while a combining efficiency of ∼50% is achieved.