Kaloyan S. Bezuhanov, A. Dreischuh, Gerhard G. Paulus, Gerhard G. Paulus, M. Schaetzel, H. Walther
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We experimentally generate optical vortices in the output beam of Ti:Sapphire laser emitting 20-fs pulses. Screw phase dislocations are imposed in each spectral component of the short pulses by aligning computer-generated hologram within a 4f-setup.
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