K. Besuchanov, A. Dreischuh, M. G. Schatzel, G.G. Paulus, H. Walther
Abstract.
We experimentally generate optical vortices in the output beam of a 20fs-Ti:sapphire laser. Screw phase dislocations are imposed on the spectral components of the short pulses by aligning a computer-generated hologram in a dispersionless 4f-setup.