title: Generation of high-photon flux-coherent soft x-ray radiation with few-cycle pulses.
abstract: We present a tabletop source of coherent soft x-ray radiation with high-photon flux. Two-cycle pulses delivered by a fiber-laser-pumped optical parametric chirped-pulse amplifier operating at 180 kHz repetition rate are upconverted via high harmonic generation in neon to photon energies beyond 200 eV. A maximum photon flux of 1.3·10(8) photons/s is achieved within a 1% bandwidth at 125 eV photon energy. This corresponds to a conversion efficiency of ~10(-9), which can be reached due to a gas jet simultaneously providing a high target density and phase matching. Further scaling potential toward higher photon flux as well as higher photon energies are discussed.
authors.forename: Stefan
authors.initials: S
authors.lastname: Demmler
authors.forename: Jan
authors.initials: J
authors.lastname: Rothhardt
authors.forename: Steffen
authors.initials: S
authors.lastname: Hädrich
authors.forename: Manuel
authors.initials: M
authors.lastname: Krebs
authors.forename: Arvid
authors.initials: A
authors.lastname: Hage
authors.forename: Jens
authors.initials: J
authors.lastname: Limpert
authors.forename: Andreas
authors.initials: A
authors.lastname: Tünnermann
mesh_terms: D001128:Argon; D009356:Neon; D017785:Photons; D014965:X-Rays
chemical_list: D009356:Neon; D001128:Argon