Quantum 2025 – scientific programme

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MON: Monday Contributed Sessions

MON 16: Quantum Spectroscopy

MON 16.6: Talk

Monday, September 8, 2025, 17:45–18:00, ZHG004

Nondipole effects in multiphoton ionization — •Katarzyna Krajewska and Jerzy Z. Kaminski — University of Warsaw, Warsaw, Poland

We study nondipole effects in multiphoton ionization of a two-dimensional hydrogen-like atom by a flat-top laser pulse. To this end, we solve numerically the Schrodinger equation treating a propagating laser pulse exactly in the entire interaction region [1]. We demonstrate a directional dependence of the energy-angular photoelectron distributions for propagating laser pulses of moderate and high intensities. It is analytically interpreted based on the leading order relativistic expansion of the electron Volkov state, showing a significant contribution of the electron recoil to that behavior. In contrast, the retardation correction originating from the space- and time-dependence of the laser field leads to a tiny redshift of the photoelectron energy spectra. Other features of ionization distributions are also analyzed, including the sidelobes and the double-hump structures of multiphoton peaks, or their disappearance for intense propagating laser pulses [2].

References

[1] M. C. Suster et al., Phys. Rev. A 107, 053112 (2023).

[2] K. Krajewska, J. Z. Kaminski, Phys. Rev. A (submitted) (2025).

Keywords: multiphoton ionization; nondipole effects; strong laser pulses; numerical solutions of the Schrodinger equation