title: Multiple-order radial-grating shearing interferometer.
abstract: A shearing interferometer suitable for coherent phasing of multiple-aperture optical systems is described. The interferometer uses the properties of a rotating radial square wave grating to simplify interaperture phase measurements. A theoretical development and the results of experiments conducted at a wavelength of 10.6 microm are presented.
authors.affiliation: MIT Lincoln Laboratory, P.O. Box 73, Lexington, Massachusetts 02173, USA.
authors.forename: P D
authors.initials: PD
authors.lastname: Henshaw
authors.forename: S K
authors.initials: SK
authors.lastname: Manlief