Abstract
Photoelectron angular distributions (PADs) from two-photon ionization of
atoms in linearly polarized strong laser fields are obtained in accordance with the
nonperturbative quantum scattering theory. We also study the influence of laser
wavelength on PADs. For two-photon ionization very close to the ionization
threshold, most of the ionized electrons are vertically ejected to the laser
polarization. PADs from two-photon ionization of atoms are determined by the second
order generalized phased Bessel function at which the ponderomotive parameter plays
a key role. In terms of dependence of PADs on laser wavelength, corresponding
variations for the ponderomotive parameter are demonstrated.
© 2011 Chinese Optics Letters
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