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Physica Scripta

QED theory of radiation emission and absorption lines for atoms in a strong laser field

Alexander V. Glushkov, Andrey V. Loboda, Elena P. Gurnitskaya, А. А. Свинаренко

Published Jul 1, 2009• 42 citations
Publisher

Abstract

The consistent approach to the ‘atom–realistic laser field’ interaction is presented, which is based on the quantum electrodynamics (QED) and the Gell–Mann and Low S -matrix formalism. . The method is applied for studying the multi-photon resonance width and shift in the atoms of H and Cs in a laser pulse.
DOI
10.1088/0031-8949/2009/t135/014022

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The consistent relativistic energy approach to the finite Fermi-systems (atoms and nuclei) in a strong realistic laser field is presented and applied to computing the multiphoton resonances parameters in some atoms and nuclei. The approach is based on the Gell-Mann and Low S-matrix formalism, multiphoton resonance lines moments technique and advanced Ivanov-Ivanova algorithm of calculating the Green's function of the Dirac equation. The data for multiphoton resonance width and shift for the Cs atom and the 57 Fe nucleus in dependence upon the laser intensity are listed.
Energy Approach to Atoms in a Laser Field and Quantum Dynamics with Laser Pulses of Different Shapes 161 strong nonlinear coupling of radiation with atoms which can not fully explained by the modern theoretical models.In any case the problem requires a consistent quantum electrodynamic approach.Another important topic is a problem of governing and control of non-linear processes in a stochastic, multi-mode laser field (Grance, 1981;Lompre et al, 1981;Zoller, 1982; Glushkov & Ivanov, 1992).The principal aim of quantum coherent control is to steer a quantum system towards a desired final state through interaction with light while simultaneously inhibiting paths leading to undesirable outcomes.This type of quantum interference is inherent in non-linear multiphoton processes.Controlling mechanisms have been proposed and demonstrated for atomic, molecular and solid-state systems (Goldansky-Letokhov, 1974, Letokhov, 1977;Delone-Kraynov, 1984).Theoretical studies of the laser-atom nonlinear interactions are often based on solving the time-dependent Schrödinger equation or using the time-independent Floquet formalism or special perturbation theories (Brändas &