title: Caustics caused by refraction in the interface between an isotropic medium and a uniaxial crystal.
abstract: In general, a caustic by refraction at an arbitrary surface is commonly known as a diacaustic. We study the formation of the diacaustic in a plane interface between an isotropic medium and a uniaxial crystal, for both ordinary and extraordinary rays, when the crystal axis is perpendicular to the plane of incidence and when it lies in the plane of incidence. For the latter case two special positions of the crystal axis with respect to the normal to the refracting surface for the extraordinary rays are treated.
authors.affiliation: Universidad Nacional Autónoma de México, Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Distrito Federal, México. maximino.avendano@ccadet.unam.mx
authors.forename: Maximino
authors.initials: M
authors.lastname: Avendaño-Alejo
authors.forename: Rufino
authors.initials: R
authors.lastname: Díaz-Uribe
authors.forename: Ivan
authors.initials: I
authors.lastname: Moreno