Spectral filtering of high-order harmonics via optics-free focusing

0546698 - FZÚ 2022 RIV US eng J - Journal Article
Veyrinas, K. - Vábek, Jan - Valentin, C. - Descamps, D. - Péjot, C. - Burgy, F. - Constant, E. - Mével, E. - Catoire, F.
Spectral filtering of high-order harmonics via optics-free focusing.
Optics Express. Roč. 29, č. 19 (2021), s. 29813-29827. ISSN 1094-4087
Research Infrastructure: ELI Beamlines III - 90141
Institutional support: RVO:68378271
Keywords : high-harmonic generation * XUV optics * laser-matter interaction * XUV spectral filtering
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 3.833, year: 2021
Method of publishing: Open access

Controlling the wavefront of an extreme ultraviolet (XUV) high-order harmonic beam during the generation process offers the capability of modifying the beam properties without resorting to any XUV optics. By characterizing the XUV intensity profile and wavefront, we quantitatively retrieve both the size and the position of the waist of each harmonic generated in an argon jet. We show that optics-free focusing can occur under specific generating conditions leading to XUV focii of micrometer size. We also demonstrate that each focus is located at distinct longitudinal positions. Using this remarkable XUV wavefront control combined with near focus spatial selection, we experimentally demonstrate efficient and adjustable spectral filtering of the XUV beam, along with a strong rejection of the fundamental beam, without using any XUV optics.
Permanent Link: http://hdl.handle.net/11104/0323782