Observation of optical vortex streets in walking second-harmonic generation.
We report what is believed to be the first experimental observation of spontaneous nucleation of arrays of optical vortices in the process of second-harmonic generation in a crystal with moderate Poynting vector walk-off, pumped with focused beams containing screw phase dislocations. Our experiments were conducted in lithium triborate under conditions of small-efficiency second-harmonic generation pumped by nanosecond pulses at 1064 nm.
Molina-Terriza
Gabriel
G
Petrov
Dmitri V
DV
Recolons
Jaume
J
Torner
Lluis
L