RT Journal Article T1 Anticaustics in a Fabry-Perot interferometer A1 Sánchez Soto, Luis Lorenzo A1 Monzón Serrano, Juan José A1 Leuchs, Gerd AB We address the response of a Fabry-Perot interferometer to a monochromatic point source. We calculate the anti -caustics (that is, the virtual wavefronts of null path difference) resulting from the successive internal reflections occurring in the system. They turn out to be a family of ellipsoids (or hyperboloids) of revolution, which allows us to reinterpret the operation of the Fabry-Perot interferometer from a geometrical point of view that facilitates comparison with other apparently disparate arrangements, such as Young's double slit. PB Optical Society of America SN 1084-7529 YR 2022 FD 2022-12-01 LK https://hdl.handle.net/20.500.14352/72946 UL https://hdl.handle.net/20.500.14352/72946 LA eng NO © 2022 Optica Publishing Group.Financial support from the Spanish Ministerio de Ciencia eInnovación (Grant PGC2018-099183-B-I00) is gratefully acknowledged NO Ministerio de Ciencia e Innovación (MICINN) DS Docta Complutense RD 18 abr 2025