Above-Threshold Ionization Process
in Intense and Ultrashort Laser Pulses
S. Laulan*, S. Barmaki
Secteur des Sciences, Université de Moncton-campus de Shippagan,
218 boulevard J. D. Gauthier, Shippagan,
* Corresponding author. E-mail: firstname.lastname@example.org
Received: 17 January 2009; revised version accepted: 10 June 2009
We present an exact 3-D numerical simulation of the above-threshold ionization (ATI) nonlinear process in the hydrogen atom. We resolve the time-dependent Schrödinger equation (TDSE) describing the motion of the one-electron atom interacting with 10-cycle intense laser pulse of wavelength ? = 228 nm and different high intensities I ³ 1014 W/cm2. The theoretical approach is based on an expansion of the wavefunctions on B-spline functions. Results of the ATI spectra for different electron angular momenta and laser intensities are presented and discussed in the context of intense and ultrashort laser pulses.
Keywords : Nonlinear process; Above-threshold ionization; one-electron atomic system; nonperturbative method; electron kinetic energy.