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Cord Arnold

Coordinator of Rydberg seminars

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Chromatic aberrations correction of attosecond high-order harmonic beams by flat-top spatial shaping of the fundamental beam

Author

  • K. Veyrinas
  • M. Plach
  • J. Peschel
  • M. Hoflund
  • F. Catoire
  • C. Valentin
  • P. Smorenburg
  • H. Dacasa
  • S. Maclot
  • C. Guo
  • H. Wikmark
  • A. Zaïr
  • V. Strelkov
  • C. Picot
  • C. Arnold
  • P. Eng-Johnsson
  • A. L’Huillier
  • E. Mével
  • E. Constant
Show all

Summary, in English

Attosecond pulses created by high-order harmonic generation in gases often exhibit strong chromatic aberrations, arising from the broad bandwidth and wavelength-dependent nonlinear light-matter interaction. When the driving laser intensity varies spatially, as for Gaussian driving beams, the apparent source position of the harmonics differs significantly from one order to the next, thus affecting the achievable intensity and duration of the attosecond pulses when they are focused on a target. We show that these chromatic aberrations can be reduced by spatially shaping the fundamental beam to generate high-order harmonics with a driver having a flat-top profile inside the gas medium. By measuring both the intensity profile and wavefront for each harmonic in a plane, we access the extreme ultra-violet (XUV) beam properties and investigate these properties near focus. We observe that controlling chromatic aberrations by flat-top spatial shaping strongly reduces the variation of the XUV spectrum on the beam axis during propagation and, in return, the longitudinal sensitivity of both the temporal profiles and the temporal shifts of the focused attosecond pulses.

Department/s

  • Atomic Physics
  • LU Profile Area: Light and Materials
  • NanoLund: Centre for Nanoscience
  • Lund Laser Centre, LLC
  • LTH Profile Area: Photon Science and Technology
  • LTH Profile Area: Nanoscience and Semiconductor Technology

Publishing year

2023-02

Language

English

Publication/Series

New Journal of Physics

Volume

25

Issue

2

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • attosecond pulses
  • chromatic aberration
  • flat-top
  • high-order harmonics
  • spatial shaping

Status

Published

ISBN/ISSN/Other

  • ISSN: 1367-2630