title: Enhanced high harmonic generation driven by high-intensity laser in argon gas-filled hollow core waveguide.
abstract: We show that a significant enhancement of the photon flux produced by high harmonic generation can be obtained through guided configuration at high laser intensity largely above the saturation intensity. We identify two regimes. At low pressure, we observe an intense second plateau in the high harmonic spectrum in argon. At relatively high pressure, complex interplay between strongly time-dependent ionization processes and propagation effects leads to important spectral broadening without loss of spectral brightness. We show that the relevant parameter for this physical process is the product of laser peak power by gas pressure. We compare source performances with high harmonic generation using a gas jet in loose focusing geometry and conclude that the source developed is a good candidate for injection devices such as seeded soft x-ray lasers or free electron lasers in the soft x-ray range.
authors: Kevin
authors: K
authors: Cassou
authors: Sameh
authors: S
authors: Daboussi
authors: Ondrej
authors: O
authors: Hort
authors: Olivier
authors: O
authors: Guilbaud
authors: Dominique
authors: D
authors: Descamps
authors: Stéphane
authors: S
authors: Petit
authors: Eric
authors: E
authors: Mével
authors: Eric
authors: E
authors: Constant
authors: Sophie
authors: S
authors: Kazamias