@inproceedings{d42f40bc0e274aa999ed011844236c27,
title = "Coherent beam combining of 60 femtosecond fiber amplifiers",
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.",
keywords = "Coherent beam combining, Femtosecond lasers, Fiber lasers",
author = "Ihsan Fsaifes and Louis Daniault and S{\'e}verine Bellanger and Matthieu Veinhard and J{\'e}r{\^o}me Bourderionnet and Christian Larat and Eric Lallier and Eric Durand and Arnaud Brignon and Chanteloup, \{Jean Christophe\}",
note = "Publisher Copyright: {\textcopyright} COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.; Fiber Lasers XVII: Technology and Systems 2020 ; Conference date: 03-02-2020 Through 06-02-2020",
year = "2020",
month = jan,
day = "1",
doi = "10.1117/12.2545229",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Liang Dong",
booktitle = "Fiber Lasers XVII",
}