Controlling the polarization and vortex charge of attosecond high-harmonic beams via simultaneous spin-orbit momentum conservation

Author
Abstract
<p>Optical interactions are governed by both spin and angular momentum conservation laws, which serve as a tool for controlling light\textendashmatter interactions or elucidating electron dynamics and structure of complex systems. Here, we uncover a form of simultaneous spin and orbital angular momentum conservation and show, theoretically and experimentally, that this phenomenon allows for unprecedented control over the divergence and polarization of extreme-ultraviolet vortex beams. High harmonics with spin and orbital angular momenta are produced, opening a novel regime of angular momentum conservation that allows for manipulation of the polarization of attosecond pulses\textemdashfrom linear to circular\textemdashand for the generation of circularly polarized vortices with tailored orbital angular momentum, including harmonic vortices with the same topological charge as the driving laser beam. Our work paves the way to ultrafast studies of chiral systems using high-harmonic beams with designer spin and orbital angular momentum.</p>
Year of Publication
2018
Journal
Nature Photonics
Volume
13
Start Page
123-130
Date Published
2018-12
ISSN Number
1749-4885
URL
https://www.nature.com/articles/s41566-018-0304-3$\#$Abs1
DOI
10.1038/s41566-018-0304-3
JILA PI
Journal Article