Micro-focusing of broadband high-order harmonic radiation by a double toroidal mirror

Research output: Contribution to journalArticle


We present an optical system based on two toroidal mirrors in aWolter configuration to focus broadband extreme ultraviolet (XUV) radiation. Optimization of the focusing optics alignment is carried out with the aid of an XUV wavefront sensor. Back-propagation of the optimized wavefront to the focus yields a focal spot of 3.6 × 4.0 μm2 full width at half maximum, which is consistent with ray-tracing simulations that predict a minimum size of 3.0 × 3.2 μm2. This work is important for optimizing the intensity of focused high-order harmonics in order to reach the nonlinear interaction regime.


External organisations
  • École Polytechnique
  • ELI-HU Non-profit Ltd
  • Lund University
  • ELI Attosecond Light Pulse Source (ELI-ALPS)
  • Imagine Optic
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics


  • Attosecond pulses, Extreme ultraviolet, High-order harmonic generation, Ultrafast nonlinear optics, Wavefront sensing, XUV focusing
Original languageEnglish
Article number1159
JournalApplied Sciences (Switzerland)
Issue number11
StatePublished - 2017 Nov 12
Publication categoryResearch