Open AccessQuasi-phase matching of high-harmonics and attosecond pulses in modulated waveguides
Author(s) -
Ivan P. Christov,
Henry C. Kapteyn,
Margaret M. Murnane
Publication year - 2000
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.7.000362
Subject(s) - attosecond , optics , harmonics , high harmonic generation , physics , harmonic spectrum , wavelength , ultrashort pulse , laser , voltage , quantum mechanics
We describe theoretically a new technique for quasi-phase-matched generation of high harmonics and attosecond pulses in a gas medium, in a high ionization limit. A corrugated hollow-core fiber modulates the intensity of the fundamental pulse along the direction of propagation, resulting in a periodic modulation of the harmonic emission at wavelengths close to the cutoff. This leads to an increase of the harmonic yield of up to three orders of magnitude. At the same time the highest harmonics merge in a broad band that corresponds to a single attosecond pulse, using 15-fs driving pulses.