title: ABCD matrix for weakly apertured Gaussian beams in the far field.
abstract: When a Gaussian beam is weakly diffracted by a circular aperture it can be approximated by another Gaussian beam with slightly different properties in the far field. In this Technical Note, using the relationship between these two Gaussian beams, before and after the aperture, an ABCD matrix is defined for cascaded laser systems.
authors.forename: S
authors.initials: S
authors.lastname: Wang
authors.forename: E
authors.initials: E
authors.lastname: Bernabeu
authors.forename: J
authors.initials: J
authors.lastname: Alda