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Open AccessArticle

Micro-Focusing of Broadband High-Order Harmonic Radiation by a Double Toroidal Mirror

1
Department of Physics, Lund University, P. O. Box 118, SE-22100 Lund, Sweden
2
Laboratoire d’Optique Applique, ENSTA ParisTech, École Polytechnique, CNRS-UMR7639, Chemin de la Hunière, 91761 Palaiseau CEDEX, France
3
ELI-ALPS, ELI-HU Non-Profit Ltd., Dugonics tr 13, 6720 Szeged, Hungary
4
Imagine Optic, 18 Rue Charles de Gaulle, 91400 Orsay, France
*
Author to whom correspondence should be addressed.
Current adress: Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, 22607 Hamburg, Germany.
Current adress: Department of Physics, Universitt Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
Appl. Sci. 2017, 7(11), 1159; https://doi.org/10.3390/app7111159
Received: 10 October 2017 / Revised: 2 November 2017 / Accepted: 7 November 2017 / Published: 12 November 2017
(This article belongs to the Special Issue Advanced EUV and X-Ray Optics)
We present an optical system based on two toroidal mirrors in a Wolter 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. View Full-Text
Keywords: high-order harmonic generation; ultrafast nonlinear optics; extreme ultraviolet; XUV focusing; wavefront sensing; attosecond pulses high-order harmonic generation; ultrafast nonlinear optics; extreme ultraviolet; XUV focusing; wavefront sensing; attosecond pulses
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MDPI and ACS Style

Coudert-Alteirac, H.; Dacasa, H.; Campi, F.; Kueny, E.; Farkas, B.; Brunner, F.; Maclot, S.; Manschwetus, B.; Wikmark, H.; Lahl, J.; Rading, L.; Peschel, J.; Major, B.; Varjú, K.; Dovillaire, G.; Zeitoun, P.; Johnsson, P.; L’Huillier, A.; Rudawski, P. Micro-Focusing of Broadband High-Order Harmonic Radiation by a Double Toroidal Mirror. Appl. Sci. 2017, 7, 1159.

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