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Proceedings Paper

Coherent beam combining of 60 femtosecond fiber amplifiers
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Paper 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.

Paper Details

Date Published: 21 February 2020
PDF: 6 pages
Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 112600L (21 February 2020); doi: 10.1117/12.2545229
Show Author Affiliations
Ihsan Fsaifes, Ecole Polytechnique (France)
Louis Daniault, Ecole Polytechnique (France)
Séverine Bellanger, Ecole Polytechnique (France)
Matthieu Veinhard, Ecole Polytechnique (France)
Jérôme Bourderionnet, Thales Research & Technology (France)
Christian Larat, Thales Research & Technology (France)
Eric Lallier, Thales Research & Technology (France)
Eric Durand, Thales LAS France SAS (France)
Arnaud Brignon, Thales Research & Technology (France)
Jean-Christophe Chanteloup, Ecole Polytechnique (France)

Published in SPIE Proceedings Vol. 11260:
Fiber Lasers XVII: Technology and Systems
Liang Dong, Editor(s)

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