1. 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, Centre d'Etudes Lasers Intenses et Applications (CELIA), Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Lund University [Lund], ASML [VELDHOVEN] (ASML), ASML Netherlands B.V., King‘s College London, Russian Academy of Science (RAS), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), The Knut and Alice Wallenberg Foundation and Région Nouvelle-Aquitaine through the’ OFIMAX’ project (contract N◦ 184289), Helmholtz Foundation through the Helmholtz-Lund International Graduate School (HELIOS, HIRS-0018), The Royal Society via the project IES\R3\203022 and UKRI-EPSRC via the project EP/J002348/1 and UKRI-STFC 1123024, European Project: 654148,H2020,H2020-INFRAIA-2014-2015,LASERLAB-EUROPE(2015), and European Project: 884900,QPAP
- Subjects
attosecond pulses high-order harmonics chromatic aberration flat-top spatial shaping ,[PHYS]Physics [physics] ,attosecond pulses ,flat-top ,chromatic aberration ,FOS: Physical sciences ,General Physics and Astronomy ,spatial shaping ,high-order harmonics ,Optics (physics.optics) ,Physics - Optics - Abstract
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., 12 pages, 8 figures + supplementary material: 10 pages, 13 figures
- Published
- 2023