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**Bauer, D. ; Ceccherini, Francesco** (2002):

*Two-color stabilization of atomic hydrogen in circularly polarized laserpulses.*

In: Physical Review A, 66 (5), APS Physics, ISSN 2469-9926,

DOI: 10.1103/PhysRevA.66.053411,

[Article]

## Abstract

The 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 Schrödinger equation. The single-color case is revisited and numerically determined ionization rates are compared with both, the exact and the approximate high-frequency Floquet rates. The positions 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 ω1 and ω2=nω1, 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.

Item Type: | Article |
---|---|

Erschienen: | 2002 |

Creators: | Bauer, D. ; Ceccherini, Francesco |

Title: | Two-color stabilization of atomic hydrogen in circularly polarized laserpulses |

Language: | English |

Abstract: | The 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 Schrödinger equation. The single-color case is revisited and numerically determined ionization rates are compared with both, the exact and the approximate high-frequency Floquet rates. The positions 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 ω1 and ω2=nω1, 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. |

Journal or Publication Title: | Physical Review A |

Volume of the journal: | 66 |

Issue Number: | 5 |

Publisher: | APS Physics |

Divisions: | 05 Department of Physics 05 Department of Physics > Institute of Applied Physics 05 Department of Physics > Institute of Applied Physics > Theoretical Quantum Physics Group |

Date Deposited: | 24 Mar 2022 07:58 |

DOI: | 10.1103/PhysRevA.66.053411 |

Additional Information: | Art.No.: 053411 |

PPN: | 498122816 |

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