title: Wavefront spacing and Gouy phase in presence of primary spherical aberration.
abstract: We study the Gouy phase of a scalar wavefield that is focused by a lens suffering from primary spherical aberration. It is found that the Gouy phase has different behaviors at the two sides of the intensity maximum. This results in a systematic increase of the successive wavefront spacings around the diffraction focus. Since all lenses have some amount of spherical aberration, this observation has implications for optical calibration and metrology.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Pang
authors.forename: David G
authors.initials: DG
authors.lastname: Fischer
authors.forename: Taco D
authors.initials: TD
authors.lastname: Visser