title: Diffractive-refractive behavior of kinoform lenses.
abstract: The connection between the diffractive behavior and the refractive behavior of kinoform lenses is investigated. The image-forming capabilities of the diffractive element are found to be expressed as an interference pattern that is due to a set of associated refractive lenses corresponding to each zone of the kinoform. The coefficient modulating the contribution of each refracting zone is determined. The term linking the point-spread function of a refractive lens and a diffractive lens is also obtained. Spectral and spatial aspects are compared as the diffractive element approaches the refractive limit.
authors.forename: T R
authors.initials: TR
authors.lastname: Sales
authors.forename: G M
authors.initials: GM
authors.lastname: Morris