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

Photonics

Jozsef Seres¹  Enikoe Seres¹  Bjoern Landgraf²  Bastian Aurand⁴  Thomas Kuehl³ 

[1] Institute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria; E-Mail:;Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich Schiller University, Max Wien Platz 1, 07743 Jena, Germany; E-Mails:;Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany; E-Mail:;Institut für Laser- und Plasmaphysik, Universität Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf, Germany; E-Mail:

关键词: high harmonic generation;    nonlinear optics;    ultrafast optics;   

DOI  :  10.3390/photonics2010104

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.