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Journal Article

Strong-field extreme-ultraviolet dressing of atomic double excitation

MPS-Authors
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Ott,  Christian
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Aufleger,  Lennart
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Ding,  Thomas
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Rebholz,  Marc
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Magunia,  Alexander
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Hartmann,  Maximilian
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Stooß,  Veit
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Wachs,  David
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Birk,  Paul
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Borisova,  Gergana Dimitrova
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Meyer,  Kristina
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Rupprecht,  Patrick
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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da Costa Castanheira,  Carina
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Moshammer,  Robert
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Pfeifer,  Thomas
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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1907.06874.pdf
(Preprint), 2MB

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Citation

Ott, C., Aufleger, L., Ding, T., Rebholz, M., Magunia, A., Hartmann, M., et al. (2019). Strong-field extreme-ultraviolet dressing of atomic double excitation. Physical Review Letters, 123(16): 163201. doi:10.1103/PhysRevLett.123.163201.


Cite as: https://hdl.handle.net/21.11116/0000-0004-F37C-F
Abstract
We report on the experimental observation of strong-field dressing of an
autoionizing two-electron state in helium with intense extreme-ultraviolet
laser pulses from a free-electron laser. The asymmetric Fano line shape of this
transition is spectrally resolved, and we observe modifications of the
resonance asymmetry structure for increasing free-electron-laser pulse energy
on the order of few tens of $\mu$J. A quantum-mechanical calculation of the
time-dependent dipole response of this autoionizing state, driven by classical
extreme-ultraviolet (XUV) electric fields, reveals a direct link between
strong-field-induced energy and phase shifts of the doubly excited state and
the Fano line-shape asymmetry. The experimental results obtained at the
Free-Electron Laser in Hamburg (FLASH) thus correspond to transient energy
shifts on the order of few meV, induced by strong XUV fields. These results
open up a new way of performing non-perturbative XUV nonlinear optics for the
light-matter interaction of resonant electronic transitions in atoms at short
wavelengths.