The study of survival for tunneling ionized atom in an elliptically polarized laser field

Abstract

By using the method of three-dimensional semiclassical electron ensemble simulation, we study the survival mechanism of tunneling ionized atom in an elliptically polarized field. It is found that for atoms with bigger ionization potential such as helium, the unionized atoms are mainly caused by the balancing of electron initial transverse velocity with the drifting velocity. For atoms with smaller ionization potential such as magnesium, Coulomb attraction plays the major role in the survival of atoms. We find a survival window to reflect the effect of Coulomb force. Result from this theory is closer to the three-dimensional semiclassical simulation than the strong-field approximation model. In addition, the distribution of survival yield on ellipticity for atoms with smaller atoms is sensitive to laser intensity which can be used to measure the intensity of super-strong laser pulses.