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Nonsequential double ionization with few-cycle laser pulses.

X Liu1, C Figueira de Morisson Faria

  • 1Max-Born-Institut, Max-Born-Strasse 2A, 12489 Berlin, Germany.

Physical Review Letters
|April 20, 2004
PubMed
Summary
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We studied electron momentum distributions in double ionization using a classical model. Results show strong phase-dependent asymmetries, offering a new method for absolute phase measurements in laser-matter interactions.

Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Mechanics
  • Laser Physics

Background:

  • Nonsequential double ionization (NDSI) is a fundamental process in strong-field physics.
  • Understanding electron momentum distributions is key to probing ionization dynamics.
  • Few-cycle laser pulses offer unique control over electron trajectories.

Purpose of the Study:

  • To investigate differential electron momentum distributions in NDSI.
  • To explore the influence of the laser pulse's absolute phase on ionization yields.
  • To establish a method for absolute phase determination.

Main Methods:

  • Utilized a classical model simulating laser-assisted inelastic (e-, 2e-) rescattering.
  • Analyzed electron momentum distributions parallel to the laser polarization.

Related Experiment Videos

  • Varied the phase difference between the pulse envelope and carrier oscillation.

    • Main Results:

    • Observed highly asymmetric electron momentum distributions.
    • Demonstrated strong dependence of yields on the phase difference.
    • Identified a critical phase where distributions radically change sign.

    Conclusions:

    • The observed phase-dependent asymmetry is a sensitive indicator of the laser pulse's absolute phase.
    • This phenomenon provides a powerful new tool for absolute phase measurements in strong-field experiments.
    • The classical rescattering model effectively captures key physics of NDSI.