Self-phase-matched high harmonic generation

  title={Self-phase-matched high harmonic generation},
  author={Tempea and Geissler and Schnurer and Brabec},
  journal={Physical review letters},
  volume={84 19},
Our theoretical analysis reveals that tunnel ionization significantly modifies the electric field of few-cycle laser pulses within a single oscillation period. This subcycle self-modulation is predicted to result in phase matching, making high harmonic generation in the x-ray regime possible for the first time. Such a radiation source opens novel possibilities in the investigation of matter with x-ray techniques, such as time resolved x-ray diffraction and absorption.