title: Kinoform lenses.
abstract: A technique for accurately figuring very thin, lightweight lenses is discussed. The phase change required to focus a plane wave into a point is calculated and photographically plotted with exposure proportional to phase (scaled from 0 to 2pi). The plot is photoreduced and the photoreduction is etched, with the depth of etch approximately proportional to the exposure. The result is a kinoform lens. Photographs taken with a kinoform lens are included.
authors.forename: J A
authors.initials: JA
authors.lastname: Jordan
authors.forename: P M
authors.initials: PM
authors.lastname: Hirsch
authors.forename: L B
authors.initials: LB
authors.lastname: Lesem
authors.forename: D L
authors.initials: DL
authors.lastname: Van Rooy