|Title||Generating a three-dimensional dark focus from a single conically refracted light beam|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||Loiko, YV, Turpin, A, Kalkandjiev, TK, Rafailov, EU, Mompart, J|
|Keywords||Birefringence, Laser cooling, Laser materials processing, Laser trapping|
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(WO4)2 biaxial crystal, reporting the generation of a bottle beam in full agreement with our theoretical investigations.