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Global optimization of high harmonic generation.

S Kazamias1, D Douillet, F Weihe

  • 1Laboratoire d'Optique Appliquée, ENSTA- Ecole Polytechnique, CNRS UMR 7639, Palaiseau, France.

Physical Review Letters
|June 6, 2003
PubMed
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We discovered how to enhance high harmonic generation (HHG) by optimizing phase matching within the absorption limit. This leads to record efficiencies in argon and potential boosts in other noble gases.

Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Nonlinear Optics
  • Quantum Optics

Background:

  • High harmonic generation (HHG) is a crucial process for producing extreme ultraviolet and X-ray radiation.
  • Optimizing conversion efficiency in HHG is essential for its practical applications.
  • Phase matching is a key factor in maximizing HHG efficiency, but its interplay with absorption has been complex.

Purpose of the Study:

  • To investigate the role of the absorption limit in optimizing high harmonic generation.
  • To experimentally determine the coherence length of the HHG process.
  • To identify conditions for enhanced harmonic dipole response and record conversion efficiencies.

Main Methods:

  • Utilized high-contrast Maker fringes for the first direct observation of the coherence length in HHG.

Related Experiment Videos

  • Conducted experiments under controlled conditions to probe the absorption limit.
  • Employed theoretical analysis to generalize findings to different geometries and phase-matching schemes.

    • Main Results:

    • Demonstrated that enhanced harmonic dipole response occurs when phase matching is within the absorption limit.
    • Achieved record conversion efficiencies in argon under these optimized conditions.
    • Showed the equivalence of guided and freely propagating HHG in the loose focusing regime.

    Conclusions:

    • The absorption limit concept is highly relevant for optimizing HHG efficiency.
    • Experimental conditions for enhanced HHG were successfully identified, leading to record efficiencies.
    • The findings predict the possibility of boosting HHG conversion efficiencies in light noble gases using advanced phase-matching techniques.