Computation of Atomic Dipole Spectra for Different Atoms by Considering Short and Long Electron Trajectories under the Intense Laser Pulse

Abstract

In this work, computation of the nonlinear dipole response of a single atom is performed by considering the ionization of the electron under the intense laser field. The dipole spectra for xenon (Xe) and argon (Ar) gases are obtained. Xe and Ar are the simples gas species having close ionization potentials. The interaction of these single atoms with the intense-short laser pulse leads to the laser-matter interaction. The short laser pulse is accepted as an ultra-short duration, i.e. the shorter time scale than the electron energy-lattice transfer process. The Keldysh parameter, which determines the ionization regime, is smaller than one because of the ionization potential of these gases. The harmonic spectra for Ar and Xe gas species are simulated by calculating the dipole spectrum considering the Lewenstein model by using a personal computer. After tunneling, the electron propagation in the short-trajectory and the combination of short and long trajectories are simulated. The effects of the short electron trajectory have noticeable effects on the dipole spectrum of a single electron.