title: Parametric amplification of attosecond pulse trains at 11 nm.
abstract: We report the first experimental demonstration of the parametric amplification of attosecond pulse trains at around 11 nm. The helium amplifier is driven by intense laser pulses and seeded by high-order harmonics pulses generated in a neon gas jet. Our measurements suggest that amplification takes place only if the seed pulse-trains are perfectly synchronized in time with the driving laser field in the amplifier. Varying the delay, we estimate the durations of the individual extreme ultraviolet pulses within the train to be on the order of 0.2 fs. Our results demonstrate that strong-field parametric amplification can be a suitable tool to amplify weak attosecond pulses from non-destructive pump-probe experiments and it is an important step towards designing amplifiers for realization of energetic XUV pulses with sub-femtosecond duration using compact lasers fitting in university laboratories.
authors.affiliation: 1] Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich Schiller University, Max Wien Platz 1, 07743 Jena, Germany [2] Institute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionalle 2, 1020 Vienna, Austria.
authors.forename: J
authors.initials: J
authors.lastname: Seres
authors.affiliation: 1] Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich Schiller University, Max Wien Platz 1, 07743 Jena, Germany [2] Institute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionalle 2, 1020 Vienna, Austria [3] Wolfgang Pauli Institute, CNRS UMI 2842, Nordbergstrasse 15, 1090 Vienna, Austria [4] Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Seres
authors.affiliation: 1] Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich Schiller University, Max Wien Platz 1, 07743 Jena, Germany [2] Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Landgraf
authors.affiliation: 1] Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany [2] GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Ecker
authors.affiliation: 1] Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany [2] GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt, Germany [3].
authors.forename: B
authors.initials: B
authors.lastname: Aurand
authors.affiliation: Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich Schiller University, Max Wien Platz 1, 07743 Jena, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Hoffmann
authors.affiliation: Institute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionalle 2, 1020 Vienna, Austria.
authors.forename: G
authors.initials: G
authors.lastname: Winkler
authors.affiliation: Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Namba
authors.affiliation: 1] Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany [2] GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Kuehl
authors.affiliation: 1] Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich Schiller University, Max Wien Platz 1, 07743 Jena, Germany [2] Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Spielmann