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.
© 2008 Optical Society of America
Original Manuscript: February 25, 2008
Revised Manuscript: April 28, 2008
Manuscript Accepted: April 29, 2008
Published: June 10, 2008
Maximino Avendaño-Alejo, Rufino Díaz-Uribe, and Ivan Moreno, "Caustics caused by refraction in the interface between an isotropic medium and a uniaxial crystal," J. Opt. Soc. Am. A 25, 1586-1593 (2008)