title: Multifilament-core fibers for high energy pulse amplification at 1.5 microm with excellent beam quality.
abstract: We report on what we believe to be the first demonstration of an erbium-ytterbium-doped multifilament-core (MFC) fiber for single-mode amplification of narrow linewidth high peak power pulses. A master-oscillator-power-fiber-amplifier laser source has been demonstrated using a 37-filament MFC fiber in the last amplification stage. Pulses with 750 microJ (940 W peak power) and laser linewidth<1 MHz have beam generated with M2 approximately 1.3. This value is close to the theoretical value M2 approximately 1.5.
authors.affiliation: Office National d'Etudes et de Recherches Aérospatiales, Département d'Optique Théorique et Appliquée, Chemin de la Hunière, Palaiseau, France. guillaume.canat@onera.fr
authors.forename: G
authors.initials: G
authors.lastname: Canat
authors.forename: S
authors.initials: S
authors.lastname: Jetschke
authors.forename: S
authors.initials: S
authors.lastname: Unger
authors.forename: L
authors.initials: L
authors.lastname: Lombard
authors.forename: P
authors.initials: P
authors.lastname: Bourdon
authors.forename: J
authors.initials: J
authors.lastname: Kirchhof
authors.forename: V
authors.initials: V
authors.lastname: Jolivet
authors.forename: A
authors.initials: A
authors.lastname: Dolfi
authors.forename: O
authors.initials: O
authors.lastname: Vasseur