title: Quadrefringence of optical vortices in a uniaxial crystal.
abstract: The splitting of a single optical vortex into four separate ones in a singular beam is theoretically and experimentally described for the propagation of obliquely incident light in a uniaxial crystal. We also find the condition under which the generated vortices in each of the four individual beams propagate independently without changing their structure and have different locations in all beams for any crystal lengths.
authors.affiliation: Department of Physics, Taurida National University, Crimea, Ukraine.
authors.forename: Tatyana
authors.initials: T
authors.lastname: Fadeyeva
authors.forename: Alexander
authors.initials: A
authors.lastname: Rubass
authors.forename: Yuriy
authors.initials: Y
authors.lastname: Egorov
authors.forename: Alexander
authors.initials: A
authors.lastname: Volyar
authors.forename: Grover
authors.initials: G
authors.lastname: Swartzlander