title: High-power Yb:YAG single-crystal fiber amplifiers for femtosecond lasers in cylindrical polarization.
abstract: We demonstrate a three-stage diode-pumped Yb:YAG single-crystal-fiber amplifier to generate femtosecond pulses at high average powers with linear or cylindrical (i.e., radial or azimuthal) polarization. At a repetition rate of 20 MHz, 750-fs pulses were obtained at an average power of 85 W in cylindrical polarization and at 100 W in linear polarization. The report includes investigations on the use of Yb:YAG single-crystal fibers with different length/doping ratio and the zero-phonon pumping at a wavelength of 969 nm in order to optimize the performance.
authors.forename: Fabien
authors.initials: F
authors.lastname: Lesparre
authors.forename: Jean Thomas
authors.initials: JT
authors.lastname: Gomes
authors.forename: Xavier
authors.initials: X
authors.lastname: Délen
authors.forename: Igor
authors.initials: I
authors.lastname: Martial
authors.forename: Julien
authors.initials: J
authors.lastname: Didierjean
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Pallmann
authors.forename: Bojan
authors.initials: B
authors.lastname: Resan
authors.forename: Michael
authors.initials: M
authors.lastname: Eckerle
authors.forename: Thomas
authors.initials: T
authors.lastname: Graf
authors.forename: Marwan
authors.initials: M
authors.lastname: Abdou Ahmed
authors.forename: Frederic
authors.initials: F
authors.lastname: Druon
authors.forename: François
authors.initials: F
authors.lastname: Balembois
authors.forename: Patrick
authors.initials: P
authors.lastname: Georges