Determination of the spectral variation origin in high-order harmonic generation in noble gases

V. E. Nefedova, M. F. Ciappina, O. Finke, M. Albrecht, J. Vábek, M. Kozlová, N. Suárez, E. Pisanty, M. Lewenstein, and J. Nejdl
Phys. Rev. A 98, 033414 – Published 20 September 2018

Abstract

One key parameter in the high-order harmonic generation (HHG) phenomenon is the exact frequency of the generated harmonic field. Its deviation from perfect harmonics of the laser frequency can be explained by considering (i) the single-atom laser-matter interaction and (ii) the spectral changes of the driving laser. In this work, we perform an experimental and theoretical study of the causes that generate spectral changes in the HHG radiation. We measured the driving-laser spectral shift after HHG in a long medium by using a correction factor to take into account the multiple possible HHG initiation distances along the laser path. We separate out the contribution of laser spectral shift from the resultant high-harmonic spectral shift in order to elucidate the microscopic effect of spectral shift in HHG. Therefore, in some cases we are able to identify the dominant electron trajectory from the experimental data. Our investigations lead to valuable conclusions about the atomic dipole phase contribution to a high-harmonic spectral shift. We demonstrate that the significant contribution of a long electron path leads to a high-harmonic shift, which differs from that expected from the driving laser. Moreover, we assess the origin of the high-order harmonics spectral broadening and provide an explanation for the narrowest high-harmonic spectral width in our experiment.

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  • Received 11 June 2018

DOI:https://doi.org/10.1103/PhysRevA.98.033414

©2018 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

V. E. Nefedova1,2, M. F. Ciappina1,*, O. Finke1,2, M. Albrecht1,2, J. Vábek1,2,3, M. Kozlová1,4, N. Suárez5, E. Pisanty5, M. Lewenstein5,6, and J. Nejdl1,4,†

  • 1Institute of Physics of the ASCR, ELI-Beamlines project, Na Slovance 2, 182 21 Prague, Czech Republic
  • 2Faculty of Nuclear Sciences and Physical Engineering CTU, Brehova 7, 115 19 Prague 1, Czech Republic
  • 3Centre Lasers Intenses et Applications CNRS-CEA, Université de Bordeaux, 351 Cours de la Libération, Talence F-33405, France
  • 4Institute of Plasma Physics ASCR, Za Slovankou 3, 182 00 Prague 8, Czech Republic
  • 5ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain
  • 6ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain

  • *marcelo.ciappina@eli-beams.eu
  • jaroslav.nejdl@eli-beams.eu

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Issue

Vol. 98, Iss. 3 — September 2018

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