Passive coherent beam combining of two femtosecond fiber chirped-pulse amplifiers

Louis Daniault 1 Marc Hanna 1 Dimitris N. Papadopoulos 1 Yoann Zaouter 2 Eric Mottay 2 Frédéric Druon 1 Patrick Georges 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Lasers
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
2 Amplitude Systèmes
Abstract : We propose and demonstrate an architecture that achieves passive coherent combination of two femtosecond fiber chirped-pulse amplifiers. The setup consists in the use of a well-balanced amplifying Sagnac interferometer. The experiment shows that the temporal, spectral, and spatial qualities of each beam are retained, with the generation of 250 fs pulses at 35MHz repetition rate, an uncompressed average power of 10W, and a combining efficiency of 96%. The behavior of this architecture in the presence of high accumulated nonlinear phase is investigated.
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Louis Daniault, Marc Hanna, Dimitris N. Papadopoulos, Yoann Zaouter, Eric Mottay, et al.. Passive coherent beam combining of two femtosecond fiber chirped-pulse amplifiers. Optics Letters, Optical Society of America, 2011, 36 (20), pp.4023-4025. ⟨hal-00702157⟩

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