Two-color stabilization of atomic hydrogen in circularly polarized laser fields

Details Two-color stabilization of atomic hydrogen in circularly polarized laser fields Two-color stabilization of atomic hydrogen in circularly polarized laser fields

2002-08-21

arxiv.org/abs/physics/0208073v1

Physics

Atomic Physics

10 pages, REVTeX4, 11 eps-figures, see also http://www.physik.tu-darmstadt.de/tqe/dieter/publist.html for a manuscript with

Scientific paper

10.1103/PhysRevA.66.053411

Dynamic stabilization of atomic hydrogen against ionization in high-frequency single- and two-color, circularly polarized laser pulses is observed by numerically solving the three-dimensional, time-dependent Schr\"odinger equation. The single-color case is revisited and numerically determined ionization rates are compared with both, exact and approximate high-frequency Floquet rates. The position of the peaks in the photoelectron spectra can be explained with the help of dressed initial states. In two-color laser fields of opposite circular polarization the stabilized probability density may be shaped in various ways. For laser frequencies $\omega_1$ and $\omega_2=n\omega_1$, $n=2,3,...$ and sufficiently large excursion amplitudes $n+1$ distinct probability density peaks are observed. This may be viewed as the generalization of the well-known ``dichotomy'' in linearly polarized laser fields, i.e, as ``trichotomy,'' ``quatrochotomy,'' ``pentachotomy'' etc. All those observed structures and their ``hula-hoop''-like dynamics can be understood with the help of high-frequency Floquet theory and the two-color Kramers-Henneberger transformation. The shaping of the probability density in the stabilization regime can be realized without additional loss in the survival probability, as compared to the corresponding single-color results.

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