title: Circular Dammann grating.
abstract: A circular Dammann grating that can produce circular equal intensities at various orders in the far field is described. A set of parameters such as order, circular number, uniformity, and diffraction efficiency has been defined to describe the novel diffractive phase elements. Numerical solutions of binary-phase (0, pi) circular Dammann gratings are given. The results of experiments with a four-order circular Dammann grating made by a lithographic technique are presented. This novel diffractive optical element should be highly interesting in a wide variety of practical applications.
authors.affiliation: Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, PO Box 800-216, Shanghai 201800, China. chazhou@mail.shcnc.ac.cn
authors.forename: Changhe
authors.initials: C
authors.lastname: Zhou
authors.forename: Jia
authors.initials: J
authors.lastname: Jia
authors.forename: Liren
authors.initials: L
authors.lastname: Liu