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Appl. Sci. 2017, 7(11), 1159; doi:10.3390/app7111159

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
Current adress: Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, 22607 Hamburg, Germany.
Current adress: Department of Physics, Universitt Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
*
Author to whom correspondence should be addressed.
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)
View Full-Text   |   Download PDF [3913 KB, uploaded 12 November 2017]   |  

Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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