Abstract

We analyze numerically and experimentally the dynamics of optical patterns in a photorefractive single feedback system where a vortex beam is used as the input beam. Depending on the vortex topological charge, on the angle of the feedback mirror inducing nonlocality and on the nonlinear photorefractive coupling strength, we observe peculiar interplays between drifting and rotating dynamics: the vortex-induced pattern rotation and the nonlocality-induced drift can annihilate each other resulting in the formation of static zones in the near field pattern. By increasing the feedback mirror tilt, we also evidence new pattern solutions forming multi-striped geometries.

© 2013 Optical Society of America