Molecular frame photoemission: a sensitive probe of the complete polarization state of high harmonic generation

[摘要] Molecular polarimetry, based on the determination of molecular frame photoemission in dissociative photoionization (DPI) studied by electron-ion coincident momentum spectroscopy, allows us to measure the complete state of elliptically polarized light. Here, we demonstrate the first complete characterization of high-order harmonic polarization state for three benchmark generation processes with inherent symmetry breaking based on the polarization of the generating beam (elliptical or counter-rotating fields) or on anisotropic targets e.g. aligned molecules. The ability to disentangle circular and unpolarized components of the XUV pulses is of particular interest to qualify the HHG sources.

[发布机构] Institut des Sciences Moléculaires d'Orsay (UMR 8214 CNRS-UniversitéParis-Sud), UniversitéParis-Sud, Bâtiment 350, Orsay; 91405, France^1;CEA-Saclay, IRAMIS, Laboratoire Interactions, Dynamique et Lasers, Gif-sur-Yvette; 91191, France^2;Department of Chemistry, Texas AandM University, College Station; TX; 77840, United States^3

[关键词] Anisotropic target;Dissociative photoionization;Elliptically polarized light;Generation process;High harmonic generation;High order harmonics;Inherent symmetry;Polarization state