title: High peak-power stretcher-free femtosecond fiber amplifier using passive spatio-temporal coherent combining.
abstract: We report on the passive coherent combining of up to 8 temporally and spatially separated ultrashort pulses amplified in a stretcher-free ytterbium-doped fiber system. An initial femtosecond pulse is split into 4 temporal replicas using divided-pulse amplification, and subsequently divided in two counter-propagating beams in a Sagnac interferometer containing a fiber amplifier. The spatio-temporal distribution of the peak-power inside the amplifier allows the generation of record 3.1 µJ and 50 fs pulses at 1 MHz of repetition rate with 52 MW of peak-power from a stretcher-free fiber amplifier and without additional nonlinear post-compression stages.
authors.affiliation: Laboratoire Charles Fabry, Institut d’Optique, CNRS, Univ Paris-Sud, 2 Av. Augustin Fresnel, 91127 Palaiseau, France. louis.daniault@institutoptique.fr
authors.forename: L
authors.initials: L
authors.lastname: Daniault
authors.forename: M
authors.initials: M
authors.lastname: Hanna
authors.forename: D N
authors.initials: DN
authors.lastname: Papadopoulos
authors.forename: Y
authors.initials: Y
authors.lastname: Zaouter
authors.forename: E
authors.initials: E
authors.lastname: Mottay
authors.forename: F
authors.initials: F
authors.lastname: Druon
authors.forename: P
authors.initials: P
authors.lastname: Georges