title: Large-mode-area erbium-ytterbium-doped photonic-crystal fiber amplifier for high-energy femtosecond pulses at 1.55 microm.
abstract: We report a high-energy femtosecond fiber amplifier based on an air-cladded single-transverse-mode erbium-ytterbium-codoped photonic-crystal fiber with a 26-microm mode-field-diameter. 700-fs, 47-MHz pulses at 1557 nm were amplified and compressed to near-transform-limited 100-fs, 7.4-nJ pulses with 54-kW peak powers without chirped-pulse amplification. A linearly polarized output with an extinction ratio exceeding 42 dB was obtained by double-pass configuration. As an application, supercontinuum spanning from 1000 to 2500 nm was generated by a successive 2-m high-nonlinear fiber with a 140-mW average power.
authors.forename: Akira
authors.initials: A
authors.lastname: Shirakawa
authors.forename: Jun
authors.initials: J
authors.lastname: Ota
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Musha
authors.forename: Ken'ichi
authors.initials: K
authors.lastname: Nakagawa
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Ueda
authors.forename: Jacob Riis
authors.initials: JR
authors.lastname: Folkenberg
authors.forename: Jes
authors.initials: J
authors.lastname: Broeng