Filters

2017 - 20183

More filters

20233
Reset filters

Settings

Author: Becker, W. × Start date: 2023 × End date: 2018 × Start date: 2017 × Type: Text × Publisher: Bristol : IOP Publ. ×

Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Electron Rescattering in a Bicircular Laser Field
    (Bristol : IOP Publ., 2017) Hasović, E.; Becker, W.; Milošević, D.B.
    We investigate high-order above-threshold ionization (HATI) of krypton atoms by a bicircular laser field, which consists of two coplanar co- or counter-rotating circularly polarized fields of frequencies rw and sw. We show that the photoelectron spectra in the HATI process, presented in the momentum plane, exhibit the same discrete rotational symmetry as the driving field. We also analyze HATI spectra for various combinations of the intensities of two field components for co- and counter-rotating fields. We find that the appearance of high-energy plateau for the counter-rotating case is vary sensitive to the laser intensity ratio, while the plateau is always absent for the co-rotating bicircular field.
  • Thumbnail Image
    Item
    Above-threshold ionization in a bicircular field: Quantum orbits unfolding in a plane
    (Bristol : IOP Publ., 2017) Becker, W.; Milošević, D.B.
    Above-threshold ionization (ATI) of atoms by a strong bicircular laser field is investigated using the strong-field approximation and the quantum-orbit theory. The bicircular field consists of two coplanar counterrotating circularly polarized fields with a frequency ratio of 2:1. The velocity map of the angle-resolved ATI spectra, both for direct and rescattered electrons, reflects the shape of a parametric plot of the bicircular field and its symmetries. It is shown that the main characteristics of the ATI spectra can be explained using only a few quantum orbits having short travel times. We also analyze a recently discovered [Phys. Rev. A 93, 052402(R) (2016)] bicircular-field-induced spin asymmetry of the ATI electrons and show that the momentum dependence of the spin-asymmetry parameter is stronger for longer wavelengths.
  • Thumbnail Image
    Item
    The plateau in above-threshold ionization: the keystone of rescattering physics
    (Bristol : IOP Publ., 2018-07-27) Becker, W.; Goreslavski, S.P.; Milošević, D.B.; Paulus, G.G.
    A review is presented of the rescattering plateau in laser-induced above-threshold ionization and its various features as they were discovered over time. Several theoretical explanations are discussed, from simple momentum conservation to the quantum-mechanical improved strong-field approximation and the inherent quantum orbits or, alternatively, entirely classical methods. Applications of the plateau to the extraction of atomic or molecular potentials and to the characterization of the driving laser pulse are also surveyed.