Antonios G. Pelekanidis, M. Du, Xiaomeng Liu, Fengling Zhang, K. Eikema, S. Witte
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Ptychographic characterization of extreme ultraviolet vortex beams
We generate multi-wavelength extreme-ultraviolet vortex beams via high-harmonic generation. We characterize the wavefronts of these high orbital angular mo-mentum beams using ptychography.