title: Refracting the k-function: Stavroudis's solution to the eikonal equation for multielement optical systems.
abstract: The k-function of Stavroudis describes a solution of the eikonal equation in a region of constant refractive index. Given the k-function describing the optical field in one region of space, and given a prescribed refractive or reflective boundary, we construct the k-function for the refracted or reflected field. This procedure, which Stavroudis calls refracting the k-function, can be repeated any number of times, and therefore extends the usefulness of the k-function formalism to multielement optical systems. As examples, we present an analytic solution for the k-function, wavefronts, and caustics generated by a biconvex thick lens illuminated by a plane wave propagating parallel to the symmetry axis, and numerical results for off-axis plane-wave illumination of a two-mirror telescope.
authors.affiliation: Picarro, Inc., 3105 Patrick Henry Drive, Santa Clara, California 95054, USA.
authors.forename: John A
authors.initials: JA
authors.lastname: Hoffnagle
authors.forename: David L
authors.initials: DL
authors.lastname: Shealy