Propagation of singular beams in a cubic optically active photorefractive crystal

The features of the propagation of singular beams with various signs of the topological charge in a cubic optically active photorefractive crystal of $(\bar{1}\bar{1}0)$ cut, to which an external electric field is applied, are investigated. The dependence of the angle of rotation of the singular beam on value of external electric field applied to the crystal and sign of unit topological charge of the beam is analyzed. It is shown how the optical activity affects the distribution of singular beam in the crystal.