title: Fabrication of large-aperture lightweight diffractive lenses for use in space.
abstract: We describe the advantages of using diffractive (Fresnel) lenses on thin membranes over conventional optics for, among others, future space telescope projects. Fabrication methods are presented for lenses on two types of freestanding membrane up to 50 cm in size. The first is a Fresnel lens etched into a thin (380-microm) glass sheet, and the second is an approximately 50-microm-thick polymer membrane containing a Fresnel lens made by replication process from a specially made fused-silica master. We show optical performance analysis of all the lenses that are fabricated, including a diffraction-limited Airy spot from a 20-m- focal-length membrane lens in a diffractive telescope system.
authors: Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA.
authors: I M
authors: IM
authors: Barton
authors: J A
authors: JA
authors: Britten
authors: S N
authors: SN
authors: Dixit
authors: L J
authors: LJ
authors: Summers
authors: I M
authors: IM
authors: Thomas
authors: M C
authors: MC
authors: Rushford
authors: K
authors: K
authors: Lu
authors: R A
authors: RA
authors: Hyde
authors: M D
authors: MD
authors: Perry