title: High-energy chirped- and divided-pulse Sagnac femtosecond fiber amplifier.
abstract: We report on the generation of 1.1-mJ, 300-fs pulses at 50 kHz by implementing an amplifier architecture whereby four stretched pulse replicas are created in the temporal and spatial domains, allowing pulse energy scaling by the same factor. The whole spatiotemporal coherent combining geometry is passive, avoiding the need for active electronic stabilization loop systems. The combining efficiency remains above 90% at all power levels.
authors.forename: Florent
authors.initials: F
authors.lastname: Guichard
authors.forename: Yoann
authors.initials: Y
authors.lastname: Zaouter
authors.forename: Marc
authors.initials: M
authors.lastname: Hanna
authors.forename: Khanh-Linh
authors.initials: KL
authors.lastname: Mai
authors.forename: Franck
authors.initials: F
authors.lastname: Morin
authors.forename: Clemens
authors.initials: C
authors.lastname: Hönninger
authors.forename: Eric
authors.initials: E
authors.lastname: Mottay
authors.forename: Patrick
authors.initials: P
authors.lastname: Georges