I. R. Khairulin, V. A. Antonov, M. Yu. Emelin, M. M. Popova, E. V. Gryzlova, M. Yu. Ryabikin, “Multilevel model of multiphoton processes in a helium atom in a strong laser field: ionization description”, Optics and Spectroscopy, 2023, Volume 131, Issue 2,Pages <nobr>136

International Conference "Ultrafast Optical Phenomena" (UltrafastLight-2022), October 03-07, 2022, Moscow
Spectroscopy of condensed state

Multilevel model of multiphoton processes in a helium atom in a strong laser field: ionization description

I. R. Khairulin^a, V. A. Antonov^a, M. Yu. Emelin^a, M. M. Popova^abc, E. V. Gryzlova^ca, M. Yu. Ryabikin^a

^a Institute of Applied Physics, Russian Academy of Sciences, 603950 Nizhny Novgorod, Russia
^b Lomonosov Moscow State University, Faculty of Physics, 119991 Moscow, Russia
^c Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, 119991 Moscow, Russia

Abstract: A multilevel model that makes it possible to describe multiphoton processes taking into account ionization in a multielectron atom irradiated by an intense laser field is proposed. Using the He atom as an example, it is shown that this model reproduces the main regularities of multiphoton ionization of an atom by an intense high-frequency laser field.

Keywords: atom in a strong field, high-order harmonic generation, multiphoton processes, atom ionization.

Received: 29.11.2022
Revised: 30.12.2022
Accepted: 28.01.2023

DOI: 10.21883/OS.2023.02.54994.5-23