Abstract

Coherent beam combining in the femtosecond regime of a record number of 19 fibers is demonstrated. The interferometric phase measurement technique, particularly well suited to phase-lock a very large number of fibers, is successfully demonstrated in the femtosecond regime. A servo loop is implemented to control piezoelectric fiber stretchers for both phase and delay variation compensation. The residual phase errors are below $\lambda /60\mathrm{rms}$. Nearly 50% of the total energy is contained in the far-field central lobe. After compression, we obtain a combined pulse width of 300 fs identical to the master oscillator pulse width.

© 2017 Optical Society of America

Coherent beam combining of 61 femtosecond fiber amplifiers

Ihsan Fsaifes, Louis Daniault, Severine Bellanger, Matthieu Veinhard, Jerome Bourderionnet, Christian Larat, Eric Lallier, Eric Durand, Arnaud Brignon, and Jean-Christophe Chanteloup
Opt. Express 28(14) 20152-20161 (2020)

Orbital angular momentum beams generation from 61 channels coherent beam combining femtosecond digital laser

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Coherent beam combining of seven fiber chirped-pulse amplifiers using an interferometric phase measurement

Anke Heilmann, Jérémy Le Dortz, Louis Daniault, Ihsan Fsaifes, Séverine Bellanger, Jérôme Bourderionnet, Christian Larat, Eric Lallier, Marie Antier, Eric Durand, Christophe Simon-Boisson, Arnaud Brignon, and Jean-Christophe Chanteloup
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