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Title: Tunable orbital angular momentum in high-harmonic generation

Optical vortices are currently one of the most intensively studied topics in optics. These light beams, which carry orbital angular momentum (OAM), have been successfully utilized in the visible and infrared in a wide variety of applications. Moving to shorter wavelengths may open up completely new research directions in the areas of optical physics and material characterization. Here, we report on the generation of extreme-ultraviolet optical vortices with femtosecond duration carrying a controllable amount of OAM. From a basic physics viewpoint, our results help to resolve key questions such as the conservation of angular momentum in highly nonlinear light–matter interactions, and the disentanglement and independent control of the intrinsic and extrinsic components of the photon’s angular momentum at short-wavelengths. Finally, the methods developed here will allow testing some of the recently proposed concepts such as OAM-induced dichroism, magnetic switching in organic molecules and violation of dipolar selection rules in atoms.
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [3] ;  [5] ;  [6] ;  [4] ;  [6] ;  [6] ;  [2] ;  [7] ;  [2] ;  [4] ;  [8]
  1. Elettra-Sincrotrone Trieste,Trieste (Italy)
  2. Univ. of Nova Gorica, Nova Gorica (Slovenia)
  3. The Ohio State Univ., Columbus, OH (United States)
  4. Univ. Paris-Saclay, Gif-sur-Yvette (France)
  5. Imagine Optic, Orsay (France)
  6. Institute of Photonics and Nanotechnologies, Padova (Italy)
  7. Univ. Paris-Sud, Orsay (France)
  8. Elettra-Sincrotrone Trieste,Trieste (Italy); Univ. of Nova Gorica, Nova Gorica (Slovenia)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
Elettra-Sincrotrone Trieste,Trieste (Italy); The Ohio State Univ., Columbus, OH (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; high-harmonic generation; nonlinear optics; ultrafast photonics
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1362024