Strong Field Ionization in Arbitrary Laser Polarizations

Abstract

We present a numerical method for investigating the non-perturbative quantum mechanical interaction of light with atoms in two dimensions, without a basis expansion. This enables us to investigate intense laser-atom interactions with light of arbitrary polarization without approximation. Results are presented for the dependence of ionization and high harmonic generation on ellipticity seen in recent experiments. Strong evidence of stabilization in circular polarization is found.

Strong-field phenomena caused by ultrashort laser pulses: Effective one- and two-dimensional quantum-mechanical descriptions

“…Figure 1(b) shows this relation for the H atom. The generalization of the 1D soft-core potential to the 2D case for the H atom is [31]:…”

“…Onedimensional soft-core potentials were used to simulate various strong-field phenomena including HHG [21,22], generation of attosecond pulses [23,24], atom stabilization [25,26], and enhanced ionization of diatomic molecules [27][28][29]. Later the 2D analog of the soft-core potential was proposed [30,31]. The use of the 2D soft-core potential allowed one to perform extensive studies in different basically multidimensional problems, for instance, to perform the description of strong-field phenomena in arbitrarily polarized laser fields [30][31][32] or beyond the dipole approximation [24,[33][34][35].…”

“…Later the 2D analog of the soft-core potential was proposed [30,31]. The use of the 2D soft-core potential allowed one to perform extensive studies in different basically multidimensional problems, for instance, to perform the description of strong-field phenomena in arbitrarily polarized laser fields [30][31][32] or beyond the dipole approximation [24,[33][34][35].…”

Nonperturbative terahertz-field interactions in semiconductor quantum wires

“…The process of HHG due to an intense atom-field interaction has received a great deal of attention in recent years, [16][17][18] and coherent short-wavelength radiation well into the x-ray region has been demonstrated. Moreover, harmonically generated x-ray transients as short as 100 as have been predicted.…”

Photon-momentum transfer in multiphoton ionization and in time-resolved holography with photoelectrons

“…To solve numerically the TDSE describing the interaction of a hydrogen atom with an intense, linearly polarized laser pulse, we use the velocity-gauge Hamiltonian in which the retardation, t ′ = t − z/c, is included in the vector potential A. We use a two-dimensional (2-D) soft-core model [9]o fa H-atom (with regularized 2-D Coulomb potential). In atomic units (m e = = e = 1) the 2-D laser + system Hamiltonian isĤ…”