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Above-threshold ionization at the few-cycle limit.

F Grasbon1, G G Paulus, H Walther

  • 1Max-Planck-Institute for Quantum Optics, 85748 Garching, Germany.

Physical Review Letters
|November 13, 2003
PubMed
Summary
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Intense few-cycle laser pulses reveal unique photoelectron spectra in rare gases. High-energy electron plateaus persist, while resonance features are suppressed, impacting electron-ion scattering.

Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Laser-Matter Interactions

Background:

  • Understanding atomic ionization dynamics under intense laser fields is crucial.
  • Few-cycle laser pulses present unique temporal characteristics compared to longer pulses.
  • Previous studies explored ionization with longer pulses, providing a baseline for comparison.

Purpose of the Study:

  • To investigate photoelectron spectra of rare-gas atoms ionized by intense few-cycle laser pulses.
  • To analyze the influence of the few-cycle regime on spectral structures, particularly at high electron energies.
  • To compare the behavior of different atomic species and discuss implications for electron-ion scattering.

Main Methods:

  • Photoelectron spectroscopy was employed to measure electron kinetic energies.

Related Experiment Videos

  • Intense few-cycle laser pulses were used as the ionization source.
  • Data analysis focused on spectral features, including plateaus and resonance structures.

    • Main Results:

    • Photoelectron spectra exhibit a persistent plateaulike structure for high electron energies.
    • A resonancelike feature observed with longer pulses is suppressed in the few-cycle regime.
    • Differences in spectral behavior were noted among various rare-gas species.

    Conclusions:

    • The few-cycle laser regime significantly modifies photoelectron spectra compared to longer pulses.
    • The suppression of resonance features has implications for understanding electron-ion scattering cross sections.
    • Species-dependent effects highlight the complexity of strong-field atomic ionization.