Abstract
We present high-order harmonic generation (HHG) in laser-produced aluminium and tin plasmas driven by a two-color field with orthogonal polarization, leading to the generation of both odd and even harmonics. We shape the effective drive field with sub-cycle resolution by controlling the phase between the fundamental wave and its second harmonic. The shape of the drive field influences the electron trajectories of the various harmonics generated in these plasmas. Here we focus on intermediate harmonic orders, with energies around the ionization potential of the target atoms. Clear oscillatory signals are observed in the HHG signals, with strongly harmonic-order-dependent modulation depth and oscillation phase. These results provide evidence for a significant influence of the Coulomb potential on the laser-driven electron trajectories in this spectral range.
Original language | English |
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Pages (from-to) | 30824-30838 |
Number of pages | 15 |
Journal | Optics Express |
Volume | 32 |
Issue number | 17 |
Early online date | 9 Aug 2024 |
DOIs | |
Publication status | Published - 12 Aug 2024 |
Bibliographical note
Publisher Copyright:© 2024 Optica Publishing Group.
Funding
Nederlandse Organisatie voor Wetenschappelijk Onderzoek. The authors thank Nik Noest for technical support, and Dr. Aneta Stodolna, Dr. Tiago de Faria Pinto, Dr. Zeudi Mazzotta and Amelie Heinzerling for their contribution to the development of the setup. This work was carried out at ARCNL, a public-private partnership between the University of Amsterdam (UvA), Vrije Universiteit Amsterdam (VU), Rijksuniversiteit Groningen (RUG), the Dutch Research Council (NWO), and the semiconductor equipment manufacturer ASML.
Funders | Funder number |
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Nederlandse Organisatie voor Wetenschappelijk Onderzoek | |
Universiteit van Amsterdam |