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29 March 2024
 
  » arxiv » 2005.4148

 Article overview


Sidebands in Electron Energy upon Multi-Photon Ionization Depend on the Relative Helicity in ($omega$, 2$omega$) Fields
S. Eckart ; D. Trabert ; K. Fehre ; A. Geyer ; J. Rist ; K. Lin ; F. Trinter ; L. Ph. H. Schmidt ; M. S. Schöffler ; T. Jahnke ; M. Kunitski ; R. Dörner ;
Date 8 May 2020
AbstractWe experimentally and theoretically compare multi-photon ionization by counter-rotating two-color (CRTC) laser fields and co-rotating two-color (CoRTC) laser fields. The CRTC and the CoRTC fields are both a superposition of circularly polarized laser pulses at a central wavelength of 390 nm and 780 nm (intensitiy ratio $I_{390}/I_{780}approx 250$). Unexpectedly, we find that the measured electron energy spectra strongly depend on the relative helicity in circularly polarized two-color laser fields. For the CRTC field, the measured electron energy spectrum is dominated by peaks that are spaced by $3.18$ eV (corresponds to light at 390 nm). For the CoRTC field, we observe additional energy peaks (sidebands). Comparison of the experimental results with our semi-classical, trajectory-based model shows excellent agreement. We conclude that the sideband visibility is modulated by a sub-cycle interference, which sensitively depends on the relative helicity in circularly polarized two-color fields.
Source arXiv, 2005.4148
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