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Quantum path interferences in high-order harmonic generation.

A Zaïr1, M Holler, A Guandalini

  • 1Physics Department, ETH Zurich, CH-8093 Zurich, Switzerland. zair@phys.ethz.ch

Physical Review Letters
|June 4, 2008
PubMed
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Scientists observed interference in high-order harmonic generation in argon, matching theoretical predictions. This attosecond time scale control is key to characterizing single-atom dipole moments.

Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Optics
  • Attosecond Science

Background:

  • High-order harmonic generation (HHG) is a crucial nonlinear process for creating extreme ultraviolet and X-ray light.
  • Theoretical models predict that HHG spectra are shaped by the interference of different quantum paths.

Purpose of the Study:

  • To experimentally investigate the intensity dependence of HHG in argon.
  • To observe and analyze the interference between the two shortest quantum paths contributing to harmonic emission.
  • To validate theoretical predictions regarding quantum path interference in HHG.

Main Methods:

  • Utilizing intense laser fields to induce HHG in argon gas.
  • Systematically varying laser intensity to control the contribution of different quantum paths.

Related Experiment Videos

  • Spectroscopic analysis of the emitted high-order harmonics.

    • Main Results:

    • Experimental conditions were identified to clearly observe interference between the two shortest quantum paths.
    • Observed interference patterns showed excellent agreement with theoretical predictions.
    • Demonstrated precise control over quantum paths on an attosecond timescale.

    Conclusions:

    • The study provides the first experimental observation of interference between specific quantum paths in HHG under controlled conditions.
    • This work represents a significant step towards the experimental characterization of the single-atom dipole moment.
    • Highlights the capability for high-accuracy quantum path control in attosecond science.