DIFFRACTIVE-REFRACTIVE BEHAVIOR OF KINOFORM LENSES

The connection between the diffractive behavior and the refractive beh avior of kinoform lenses is investigated. The image-forming capabiliti es of the diffractive element are found to be expressed as an interfer ence pattern that is due to a set of associated refractive lenses corr esponding 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. spatial aspects are compared as the diffractive elem ent approaches the refractive limit. Society of America