Dynamics of Strong-Field Double Ionization in Two-Color Counterrotating Fields.
The double ionization of helium in bichromatic, circularly polarized intense laser fields is analyzed with a classical ensemble approach. It is found that counterrotating fields produce significant nonsequential double-ion yield and drive novel ionization dynamics. It is shown that distinct pathways to ionization can be modified by altering the relative intensities of the two colors, allowing for unique control of strong-field processes. Electrons are observed to return to the ion at different angles from the angle of ionization, opening new possibilities for probing electronic and molecular structure on the ultrafast time scale.
Department of Physics and Astronomy, University of Northern Colorado, Greeley, Colorado 80639, USA.
Jan L
JL
Chaloupka
JILA-Department of Physics, University of Colorado and NIST, Boulder, Colorado 80309, USA.
Daniel D
DD
Hickstein