Figure 3: Characterization of wavefronts and modulation of topological charges.
From: Controlling the orbital angular momentum of high harmonic vortices
(a) Schematic of the interferometric wavefront characterization procedure. (b,c,d) Interference patterns of the Gaussian reference beams and OAM beams of charges lXUV=+1, 0, −1. (e) The sign of topological charge at −1st order diffraction is flipped from lXUV=−1 to lXUV=+1 by changing the incident polarization.
