14 June 2006 Non-perturbative theory of atomic ultrastrong laser field ionization
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Proceedings Volume 6259, ICONO 2005: Nonlinear Optical Phenomena; 625901 (2006) https://doi.org/10.1117/12.677863
Event: ICONO 2005, 2005, St. Petersburg, Russian Federation
The dynamics of atomic ionization by strong and superstrong laser field is now under intensive experimental and theoretical study [1-5]. In the present paper we develop the method, initially suggested in [4], by which we attempt to solve non-relativistic problem of ionization of single hydrogen like atom exposed to sub-, atomic and superatomic impact laser field from the ground state. Within the framework of this method we investigated matrix element of the ionization transition and revealed its substantially nonlinear dependence on the laser field amplitude. This allowed us to find new selection rules, which differ from that in dipole, quadruple or any other approximation of finite multipolarity. We are interested here in the above threshold ionization (ATI), therefore it is assumed that the atomic spectrum consists of the ground state and continuous spectrum. Both ionization and recombination processes are taken into account. The proposed method enables us to account for the ionization processes ofthe arbitrary order. The population ofthe states of the quasi-energy spectrum as a function of the laser field amplitude is investigated. The obtained dependency of the average ionization rate on the laser field amplitude is compared with the Keldysh formula.
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Anatoliy V. Andreev, Anatoliy V. Andreev, Olga A. Shoutova, Olga A. Shoutova, Vladimir A. Makarov, Vladimir A. Makarov, "Non-perturbative theory of atomic ultrastrong laser field ionization", Proc. SPIE 6259, ICONO 2005: Nonlinear Optical Phenomena, 625901 (14 June 2006); doi: 10.1117/12.677863; https://doi.org/10.1117/12.677863


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