title: Refractive index and spectral models for gradient-index materials.
abstract: Models are presented which describe the refractive index and spectral variation of gradient-index materials. Classes of gradient which exhibit little or no variation with wavelength are predicted. These are termed achromatic gradients. Experimental verification of the models is presented in a following paper.
authors.affiliation: University of Rochester, Institute of Optics, Rochester, New York 14627, USA.
authors.forename: S D
authors.initials: SD
authors.lastname: Fantone