26 February 2018 Towards coherent combination of 61 fiber amplifiers
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Proceedings Volume 10512, Fiber Lasers XV: Technology and Systems; 105120B (2018) https://doi.org/10.1117/12.2287862
Event: SPIE LASE, 2018, San Francisco, California, United States
The XCAN project aims at the coherent combination of 61 fiber amplifiers in the femtosecond regime. An important intermediate step towards this goal is the implementation of a seven fiber test setup, which allows to address key scientific and technical challenges which might occur in the scaled version of 61 fibers. This work includes the design and characterization of a support unit able to hold 61 fibers with the high precision required for an efficient coherent combination in tiled aperture configuration. This configuration, in combination with an interferometric phase measurement and active phase control, is particularly well suited for the coherent combination of a very large number of beams. Our first preliminary results with seven fibers include a combination efficiency of 30 % and a residual phase error between two fibers as low as λ/40 rms. Experiments conducted with three fibers in order to evaluate technical improvements revealed an increase of efficiency to 54 %. The combined beam was temporally compressed to 225 fs, which is Fourier transform limited with respect to the measured spectrum.
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Anke Heilmann, Jérémy Le Dortz, Louis Daniault, Ihsan Fsaifes, Séverine Bellanger, Marie Antier, Jérôme Bourderionnet, Christian Larat, Eric Lallier, Eric Durand, Arnaud Brignon, Christophe Simon-Boisson, Jean-Christophe Chanteloup, "Towards coherent combination of 61 fiber amplifiers", Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105120B (26 February 2018); doi: 10.1117/12.2287862; https://doi.org/10.1117/12.2287862

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