Generation Dynamics of Broadband Extreme Ultraviolet Vortex Beams.

ABSTRACT: Light beams carrying orbital angular momentum (OAM) can be generated in the extreme ultraviolet and soft X-ray spectra by means of high harmonic generation (HHG). In HHG, phase properties of the drive laser, such as curvature, aberrations, and topological charge, are upconverted to the harmonic beams and coherently added to the inherent dipole phase. The strong nonlinearity of the HHG process, combined with the rapid phase variations corresponding to large OAM values in these vortex beams, leads to a high sensitivity to small variations in the driving field. However, a study of the generation dynamics via an accurate reconstruction of multiwavelength OAM beams is challenging. Here we show full complex field measurements of multiple individual harmonics of the HHG vortex beams. By using spe

SUBMITTER: Pelekanidis A 

PROVIDER: S-EPMC11926965 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature