Journal
APPLIED SCIENCES-BASEL
Volume 7, Issue 11, Pages -Publisher
MDPI AG
DOI: 10.3390/app7111159
Keywords
high-order harmonic generation; ultrafast nonlinear optics; extreme ultraviolet; XUV focusing; wavefront sensing; attosecond pulses
Categories
Funding
- Swedish Research Council
- Swedish Foundation for Strategic Research
- European Research Council [339253 PALP]
- LASERLAB-EUROPE [LLC002276]
- European COST Actions [MP1203, CM1204]
- European Union's Horizon research and innovation program under Marie Sklodowska-Curie Grant [641789MEDEA]
- FET-open grant [665207 VOXEL]
- European Union [GINOP-2.3.6-15-2015-00001]
- European Regional Development Fund
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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 x 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 x 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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