Self-phase-matched high harmonic generation
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.
Tempea
G
Institut fur Photonik, Technische Universitat Wien, Gusshausstrasse 27/387, A-1040 Wien, Austria.
Geissler
M
Schnurer
M
Brabec
T