https://doi.org/10.1051/epjconf/202430907010
Modeling extreme ultraviolet attosecond pulses in modulated waveguides
1 National Institute for R&D of Isotopic and Molecular Technologies, Cluj-Napoca, Romania
2 Institute for Photonics and Nanotechnologies, National Research Council, Milano, Italy
3 Politecnico di Milano, Physics Department, Milano, Italy
* e-mail: tosa@itim-cj.ro
Published online: 31 October 2024
We explore via numerical modeling the generation of very short photon wavelengths in hollow core waveguides (HCW) filled with He gas at high pressures. Propagation of femtosecond driving pulses is first solved using a split-step method and tested against other methods. The propagation along the HCW reveals mode beating seen in quasi-periodic oscillations of the field intensity and phase which in turn will determine the single atom response to the field. We explore both cylindrical and conical HCW in which the guide diameter varies along the propagation direction. This second configuration generates very high harmonic orders in a regime of quasi-phase matching. We found three spectral ranges which show amplification, at 3.5, 7.6, and 11-13 nm, which are of great interest given their practical applications in spectroscopy, XUV metrology and photolithography.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
