Free electron laser generation of X-ray Poincaré beams

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Abstract

An optics-free method is proposed to generate x-ray radiation with spatially variant states of polarization via an afterburner extension to a free electron laser. Control of the polarization in the transverse plane is obtained through the overlap of different coherent transverse light distributions radiated from a bunched electron beam in two consecutive orthogonally polarised undulators. Different transverse profiles are obtained by emitting at a higher harmonic in one or both of the undulators. This method enables the generation of beams structured in their intensity, phase, and polarization - so-called Poincaré beams - at high powers with tunable wavelengths. Simulations are used to demonstrate the generation of two different classes of light with spatially inhomogeneous polarization - cylindrical vector beams and full Poincaré beams.

Original languageEnglish
Article number072001
Number of pages7
JournalNew Journal of Physics
Volume22
Issue numberJuly
Early online date1 Jun 2020
DOIs
Publication statusPublished - 21 Jul 2020

Keywords

  • Free Electron Lasers (FEL)
  • electron beams
  • Poincaré beams
  • tunable wavelengths

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