title: Nonwalk-off multipass Twyman-Green interferometer.
abstract: A modification of the multipass Twyman-Green interferometer is suggested that avoids the walk-off problem. Also, a data reduction scheme has been developed that permits most of the aberrations of the ancillary optics to be separated from those of the test piece.
authors.forename: W C
authors.initials: WC
authors.lastname: Sweatt