Optical anisotropy induced by torsion stresses in LiNbO3 crystals: appearance of an optical vortex

We report the results of studies of torsion effect on the optical birefringence in LiNbO3 crystals. We have found that twisting of those crystals causes a birefringence distribution revealing non-trivial peculiarities. In particular, it has a special point at the center of cross section perpendicular to the torsion axis where zero birefringence value occurs. It has also been ascertained that the surface of the spatial birefringence distribution has a conical shape, with the cone axis coinciding with the torsion axis. We have revealed that an optical vortex, with the topological charge equal to unity, appears under the torsion of LiNbO3 crystals. It has been shown that, contrary to the q-plate, both the efficiency of spin-orbital coupling and the orbital momentum of the emergent light can be operated by the torque moment.Comment: 28 pages, 8 figure

Visualization 3: Generation of dynamic Bessel beams and dynamic bottle beams using acousto-optic effect

Dynamics of bottle beams Originally published in Optics Express on 17 October 2016 (oe-24-21-23977

Visualization_2.avi

Image of the USAF resolution target using confocal microscopy with high-speed acousto-optic len

Visualization_1.avi

Dynamics of the light beam wavefront after passing through the high-speed acousto-optic len