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Quantum Path Interference and Multiple Electron Scattering in Soft X-Ray High-Order Harmonic Generation

Institute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria
Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich Schiller University, Max Wien Platz 1, 07743 Jena, Germany
Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany
Institut für Laser- und Plasmaphysik, Universität Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf, Germany
GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, 64291 Darmstadt, Germany
Author to whom correspondence should be addressed.
Photonics 2015, 2(1), 104-123;
Received: 10 December 2014 / Accepted: 13 January 2015 / Published: 23 January 2015
(This article belongs to the Special Issue Extreme UV Lasers: Technologies and Applications)
PDF [976 KB, uploaded 23 January 2015]


High-order harmonic generation is an important mechanism to generate coherent radiation in the few–100-eV spectral range with ultrashort laser pulses. Moreover, a closer inspection of the measured spectra provides unique information about the underlying physics and allows deriving guidelines for improvements. The long-range modulation of the spectral envelope is linked to phase matching, and we will show how to improve it with a double-pulse excitation scheme. Additionally, the spectrum contains only every fourth harmonic, which can be well explained by the quantum interference of multiple scattered electrons, and two dominant electron trajectories were selected by X-ray parametric interaction. View Full-Text
Keywords: high harmonic generation; nonlinear optics; ultrafast optics high harmonic generation; nonlinear optics; ultrafast optics

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Seres, J.; Seres, E.; Landgraf, B.; Aurand, B.; Kuehl, T.; Spielmann, C. Quantum Path Interference and Multiple Electron Scattering in Soft X-Ray High-Order Harmonic Generation. Photonics 2015, 2, 104-123.

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