title: Effect of retroreflection on a Fizeau phase-shifting interferometer.
abstract: Phase errors in a Fizeau phase-shifting interferometer caused by multiple-reflected beams from a retroreflective optics, such as a corner cube and a right-angle prism, are studied. Single- and double-pass configurations are presented, and their measurement results are compared. An attenuator is not needed in a double-pass configuration because light is reflected by the retroreflective optics twice and the reference surface once and hence the intensities match. It is more accurate to test a corner cube or a right-angle prism in a double-pass configuration than in a single-pass configuration. Simulations and experimental results are presented.
authors.forename: C
authors.initials: C
authors.lastname: Ai
authors.forename: J C
authors.initials: JC
authors.lastname: Wyant