Quantum path interference in the wavelength dependence of high-harmonic generation.
We investigate the dependence of the intensity of radiation due to high-harmonic generation as a function of the wavelength lambda of the fundamental driver field. Superimposed on a smooth power-law dependence observed previously, we find surprisingly strong and rapid fluctuations on a fine lambda scale. We identify the origin of these fluctuations in terms of quantum path interferences with up to five returning orbits significantly contributing.
Schiessl
K
K
Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A-1040 Vienna, Austria. klaus@concord.itp.tuwien.ac.at
Ishikawa
K L
KL
Persson
E
E
Burgdörfer
J
J