%0 Journal Article
%T Generation of phase-matched circularly-polarized extreme ultraviolet high harmonics for magnetic circular dichroism spectroscopy
%A Ofer Kfir
%A Patrik Grychtol
%A Emrah Turgut
%A Ronny Knut
%A Dmitriy Zusin
%A Dimitar Popmintchev
%A Tenio Popmintchev
%A Hans Nembach
%A Justin M. Shaw
%A Avner Fleischer
%A Henry Kapteyn
%A Margaret Murnane
%A Oren Cohen
%J Physics
%D 2014
%I arXiv
%X Circularly-polarized extreme UV and X-ray radiation provides valuable access to the structural, electronic and magnetic properties of materials. To date, this capability was available only at large-scale X-ray facilities such as synchrotrons. Here we demonstrate the first bright, phase-matched, extreme UV circularly-polarized high harmonics and use this new light source for magnetic circular dichroism measurements at the M-shell absorption edges of Co. We show that phase matching of circularly-polarized harmonics is unique and robust, producing a photon flux comparable to the linearly polarized high harmonic sources that have been used very successfully for ultrafast element-selective magneto-optic experiments. This work thus represents a critical advance that makes possible element-specific imaging and spectroscopy of multiple elements simultaneously in magnetic and other chiral media with very high spatial and temporal resolution, using tabletop-scale setups.
%U http://arxiv.org/abs/1401.4101v3