title: Generating a three-dimensional dark focus from a single conically refracted light beam.
abstract: We report here the generation of a three-dimensional (3D) dark focus from a single focused monochromatic Gaussian beam that undergoes conical refraction when it propagates along one of the optic axes of a biaxial crystal. We study the resulting ring intensity pattern behind the crystal as a function of the ratio between the ring radius and the beam waist and derive the particular parameter values for which a 3D dark focus with null intensity at the ring center is formed. We have performed experiments with a KGd(WO(4))(2) biaxial crystal, reporting the generation of a bottle beam in full agreement with our theoretical investigations.
authors: Yu V
authors: YV
authors: Loiko
authors: A
authors: A
authors: Turpin
authors: T K
authors: TK
authors: Kalkandjiev
authors: E U
authors: EU
authors: Rafailov
authors: J
authors: J
authors: Mompart