title: Design of gradient-index spherical lenses for optical pickup systems.
abstract: Aberration of large numerical-aperture gradient-index lenses for optical pickup systems can be corrected with spherical surfaces whose curvatures are chosen corresponding to the measured values of the fourth- and sixth-order refractive-index coefficients.
authors.forename: K
authors.initials: K
authors.lastname: Kikuchi
authors.forename: S
authors.initials: S
authors.lastname: Ishihara
authors.forename: H
authors.initials: H
authors.lastname: Shimizu
authors.forename: J
authors.initials: J
authors.lastname: Shimada