Coulomb focusing at above-threshold ionization in elliptically polarized mid-infrared strong laser fields

Abstract

The role of Coulomb focusing in above-threshold ionization in an elliptically polarized mid-infrared strong laser field is investigated within a semiclassical model incorporating tunneling and Coulomb field effects. It is shown that Coulomb focusing up to moderate ellipticity values is dominated by multiple forward scattering of the ionized electron by the atomic core that creates a characteristic low-energy structure in the photoelectron spectrum and is responsible for the peculiar energy scaling of the ionization normalized yield along the major polarization axis. At higher ellipticities, the electron continuum dynamics is disturbed by the Coulomb field effect mostly at the exit of the ionization tunnel. Due to the latter, the normalized yield is found to be enhanced, with the enhancement factor being sharply pronounced at intermediate ellipticities.

References in corpus (9)

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Cited by in corpus (5)

• Slalom in complex time: emergence of low-energy structures in tunnel ionization via complex time contours
• Analytical approach to Coulomb focusing in strong field ionization
• Coulomb focusing in retrapped ionization with near-circularly polarized laser field
• Sub-cycle time-resolved nondipole dynamics in tunneling ionization
• Interplay between Coulomb-focusing and non-dipole effects in strong-field ionization with elliptical polarization