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Self-phase-matched high harmonic generation

Tempea1, Geissler, Schnurer

  • 1Institut fur Photonik, Technische Universitat Wien, Gusshausstrasse 27/387, A-1040 Wien, Austria.

Physical Review Letters
|September 16, 2000
PubMed
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Tunnel ionization alters laser electric fields, enabling phase matching for the first time. This breakthrough paves the way for novel X-ray generation and advanced material studies.

Area of Science:

  • Quantum optics
  • Laser-plasma interactions
  • Attosecond science

Background:

  • Few-cycle laser pulses are crucial for high-intensity light-matter interactions.
  • Controlling laser pulse electric fields at the sub-cycle level is a significant challenge.
  • Generating coherent X-rays requires precise control over high-harmonic generation (HHG).

Purpose of the Study:

  • To theoretically investigate the impact of tunnel ionization on few-cycle laser pulse electric fields.
  • To explore the potential for achieving phase matching in high harmonic generation.
  • To establish the feasibility of generating X-rays using this novel mechanism.

Main Methods:

  • Theoretical analysis of laser pulse propagation in ionized media.
  • Modeling of sub-cycle electric field dynamics during tunnel ionization.

Related Experiment Videos

  • Calculation of phase-matching conditions for high harmonic generation.

    • Main Results:

    • Tunnel ionization significantly modifies the electric field of few-cycle laser pulses within a single oscillation period.
    • Sub-cycle self-modulation of the laser electric field leads to predicted phase matching.
    • This mechanism enables, for the first time, high harmonic generation in the X-ray regime.

    Conclusions:

    • The theoretical findings demonstrate a novel pathway for X-ray generation.
    • This sub-cycle self-modulation effect offers unprecedented control over HHG.
    • The resulting X-ray source opens new avenues for time-resolved X-ray diffraction and absorption studies of matter.