title: Holography as a tool in the testing of large aperture optics.
abstract: This paper describes applications of holography to the testing of large optical surfaces. In one application a hologram of the wavefront from the mirror is made with a pulsed laser and then used in place of the mirror for Foucault knife-edge testing. This allows the mirror to be tested in its working environment. In the second application the hologram is made in the same manner, but is used in a common path interferometer where the reconstructed point image of the mirror is interfered against a point source to show the difference between the mirror surface and a reference sphere.
authors.affiliation: Willow Run Laboratories, The University of Michigan, P.O. Box 618, Ann Arbor, Michigan, USA.
authors.forename: B P
authors.initials: BP
authors.lastname: Hildebrand
authors.forename: K A
authors.initials: KA
authors.lastname: Haines
authors.forename: R
authors.initials: R
authors.lastname: Larkin