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

Abstract : We present an optical system based on two toroidal mirrors in a Wolter configuration to focus broadband 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$\times$4.0 $\mu$m$^2$ full width at half maximum, which is consistent with ray-tracing simulations that predict a minimum size of 3.0$\times$3.2 $\mu$m$^2$. This work is important for optimizing the intensity of focused high-order harmonics in order to reach the nonlinear interaction regime.
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Journal articles
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https://hal.archives-ouvertes.fr/hal-01669428
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Submitted on : Wednesday, December 20, 2017 - 10:05:13 PM
Last modification on : Friday, January 7, 2022 - 3:44:27 AM

### Citation

Hélène Coudert-Alteirac, Hugo Dacasa, Filippo Campi, Emma Kueny, Balázs Farkas, et al.. Micro-focusing of broadband high-order harmonic radiation by a double toroidal mirror. Appl.Sciences, 2017, 7 (11), pp.1159. ⟨10.3390/app7111159⟩. ⟨hal-01669428⟩

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