- Letter
- Open Access
Few-cycle vortices from superradiant nonlinear Thomson scattering by a relativistic chirped mirror
Phys. Rev. Research 5, L032034 – Published 12 September, 2023
DOI: https://doi.org/10.1103/PhysRevResearch.5.L032034
Abstract
We propose a scheme to generate few-cycle vortices based on nonlinear Thomson scattering by microbunched electrons from a circularly polarized laser pulse with chirped frequency. At sufficiently high intensities, the generation of harmonics that carry orbital angular momentum occurs. At the same time, the electrons collectively act as a relativistic chirped mirror, which superradiantly reflects a chosen harmonic into a single localized beat. Calculations show that a few-cycle soft x-ray vortex with gigawatt peak power can be generated if this scheme is applied to a pC electron bunch with a few MeV kinetic beam energy.
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