title: Active optics: single actuator principle and angular thickness distribution for astigmatism compensation by elasticity.
abstract: Active optics techniques providing high quality large astigmatism compensations to be used in a fixed or variable optical path, are presented in three ways: analytical calculations, finite element analysis, and experimental validation. The use of an angular thickness distribution allows improving the optical quality of toroidal deformations. We emphasize the case of a single actuator design, in which the principle is proven with a prototype.
authors.affiliation: Laboratoire d'Astrophysique de Marseille, Université de Provence Aix-Marseille I, CNRS/INSU 2, Marseille Cedex.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Hugot
authors.forename: Gérard R
authors.initials: GR
authors.lastname: Lemaître
authors.forename: Marc
authors.initials: M
authors.lastname: Ferrari