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Cord Arnold

Koordinator för Mötesplats Rydbergseminarier

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

Författare

  • 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
Visa allt

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.

Avdelning/ar

  • Atomfysik
  • LU profilområde: Ljus och material
  • NanoLund: Centre for Nanoscience
  • Lunds lasercentrum, LLC
  • LTH profilområde: Avancerade ljuskällor
  • LTH profilområde: Nanovetenskap och halvledarteknologi

Publiceringsår

2023-02

Språk

Engelska

Publikation/Tidskrift/Serie

New Journal of Physics

Volym

25

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

IOP Publishing

Ämne

  • Atom and Molecular Physics and Optics

Nyckelord

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

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1367-2630