Enhanced high harmonic generation driven by high-intensity laser in argon gas-filled hollow core waveguide.

Olivier Guilbaud
Olivier Guilbaud
Centre Hospitalier de Versailles
Dominique Descamps
Dominique Descamps
GSK Vaccines
Stephane Petit
Stephane Petit
Laboratory of Molecular Oral Pathophysiology
Eric Constant
Eric Constant
Université Catholique de Louvain

Opt Lett 2014 Jul;39(13):3770-3

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.
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July 2014
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