title: Wavefront reversal technique for self-referencing collimation testing.
abstract: We present a wavefront reversal technique to produce a dual-field fringe pattern for self-referencing collimation testing in wedge-plate lateral-shear interferometry. The method requires only a suitably placed cubic beam splitter to produce two replicas of the fringe field formed by the wedge-plate lateral-shear interferometer. One of the replicas has a fringe pattern that is the reverse of the other. With these two fringe fields, the collimation testing has a built-in reference, and the detection sensitivity is twice that of a single-wedge-plate technique.
authors.affiliation: Department of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: King Ung
authors.initials: KU
authors.lastname: Hii
authors.forename: Kuan Hiang
authors.initials: KH
authors.lastname: Kwek