title: Using gradient-index lenses for laser-beam expansion in interferometry.
abstract: The use of gradient-index lenses, which inherently have fewer surface defects than conventional convex lenses, for laser-beam expansion in interferometry results in improved fringe visibility without loss of light intensity and the need for stringent alignment requirements.
authors.forename: T W
authors.initials: TW
authors.lastname: Ng
authors.forename: F S
authors.initials: FS
authors.lastname: Chau