title: 4x4 ray matrix for a curved chirped grating at oblique incidence.
abstract: The general 4x4 ray matrix of a grating is presented. This matrix suits the cases of transmission and reflection by a chirped grating with curved lines lying on a curved interface. The matrix presented applies to the general oblique incidence of the optical axis and therefore to nonorthogonal cases and to conical diffraction.
authors.affiliation: Centre d'Optique, Photonique et Laser (COPL), Departement de Physique, Genie Physique et Optique, Universite Laval, Quebec, Canada.
authors.forename: Gilles
authors.initials: G
authors.lastname: Fortin
authors.forename: Nathalie
authors.initials: N
authors.lastname: McCarthy