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Sideband modulation by subcycle interference

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Trinter,  Florian
Institut für Kernphysik, Goethe-Universität;
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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PhysRevA.102.043115.pdf
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Citation

Eckart, S., Fehre, K., Geyer, A., Rist, J., Lin, K., Trinter, F., et al. (2020). Sideband modulation by subcycle interference. Physical Review A, 102(4): 043115. doi:10.1103/PhysRevA.102.043115.


Cite as: http://hdl.handle.net/21.11116/0000-0007-5406-4
Abstract
We experimentally and theoretically show that the electron energy spectra strongly depend on the relative helicity in highly intense, circularly polarized two-color laser fields, which is an unexpected finding. The employed counter-rotating two-color (CRTC) fields and the corotating two-color (CoRTC) fields are both a superposition of circularly polarized laser pulses at a central wavelength of 390 and 780 nm (intensity ratio I390/I780 ≈ 250). For the CRTC field, the measured electron energy spectrum is dominated by peaks that are spaced by 3.18 eV (corresponds to the photon energy of light at a wavelength of 390 nm). For the CoRTC field, we observe additional energy peaks (sidebands). Using our semiclassical, trajectory-based models, we conclude that the sideband intensity is modulated by a subcycle interference, which sensitively depends on the relative helicity in circularly polarized two-color fields.