title: Bright attosecond soft X-ray pulse trains by transient phase-matching in two-color high-order harmonic generation.
abstract: We study two-color high-order harmonic generation in Neon with 790 nm and 1300 nm driving laser fields and observe an extreme-ultraviolet continuum that extends to photon energies of 160 eV. Using a 6-mm-long, high pressure gas cell, we optimize the HHG yield at high photon energies and investigate the effect of ionization and propagation under phase-matching conditions that allow us to control the temporal structure of the XUV emission. Numerical simulations that include the 3D propagation of the two-color laser pulse show that a bright isolated attosecond pulse with exceptionally high photon energies can be generated in our experimental conditions due to an efficient hybrid optical and phase-matching gating mechanism.
authors.forename: Bernd
authors.initials: B
authors.lastname: Schütte
authors.forename: Paul
authors.initials: P
authors.lastname: Weber
authors.forename: Katalin
authors.initials: K
authors.lastname: Kovács
authors.forename: Emeric
authors.initials: E
authors.lastname: Balogh
authors.forename: Balázs
authors.initials: B
authors.lastname: Major
authors.forename: Valer
authors.initials: V
authors.lastname: Tosa
authors.forename: Songhee
authors.initials: S
authors.lastname: Han
authors.forename: Marc J J
authors.initials: MJ
authors.lastname: Vrakking
authors.forename: Katalin
authors.initials: K
authors.lastname: Varjú
authors.forename: Arnaud
authors.initials: A
authors.lastname: Rouzée