title: Spatial correlation properties of focused partially coherent vortex beams.
abstract: The spatial correlation properties in the geometrical focal region of a converging, partially coherent vortex wave field are analyzed. Expressions are derived for a pair of points on the axis of symmetry and for a pair of points in the focal plane. It is found that the longitudinal and transverse coherence lengths in the focal region change with the variation of the topological charge and the normalized coherence length of the vortex field. In addition, the degree of coherence is shown to possess phase singularities.
authors.affiliation: Department of Electronic Science and Technology, Huaqiao University, Quanzhou, Fujian, China.
authors.forename: Lianzhou
authors.initials: L
authors.lastname: Rao
authors.forename: Jixiong
authors.initials: J
authors.lastname: Pu