Vortices in femtosecond laser fields.
We experimentally generate optical vortices in the output beam of a 20-fs 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.
Bezuhanov
K
K
Department of Quantum Electronics, Sofia University, 5, J. Bourchier Boulevard, BG-1164 Sofia, Bulgaria.
Dreischuh
A
A
Paulus
G G
GG
Schätzel
M G
MG
Walther
H
H