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, New-Brunswick, Canada, E8S 1P6

* Corresponding author. E-mail: stephane.laulan@umcs.ca

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.

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