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29 March 2024 |
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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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