title: Two-mirror telescope design with third-order coma insensitive to decenter misalignment.
abstract: Misalignments always occur in real optical systems. These misalignments do not generate new aberration forms, but they change the aberration field dependence. Two-mirror telescopes have been used in several applications. We analyze a two-mirror telescope configuration that has negligible sensitivity to decenter misalignments. By applying the wave aberration theory for plane-symmetric optical systems it is shown that the asphericity in the secondary mirror, if properly chosen, can compensate for any decenter perturbation allowing third-order coma unchanged across the field of view. For any two-mirror system it is possible to find a configuration in which decenter misalignments do not generate field-uniform coma.
authors.affiliation: Instituto de Física de São Carlos, Universidade de São Paulo (IFSC-USP), Av. Trabalhador São-carlense, 400, CEP:13560-970, São Carlos, SP, Brazil. lucimara@ifsc.usp.br
authors.forename: Lucimara Cristina Nakata
authors.initials: LC
authors.lastname: Scaduto
authors.forename: Jose
authors.initials: J
authors.lastname: Sasian
authors.forename: Mario Antonio
authors.initials: MA
authors.lastname: Stefani
authors.forename: Jarbas Caiado de Castro
authors.initials: JC
authors.lastname: Neto
mesh_terms: D016477:Artifacts; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007089:Image Enhancement / Q000295:instrumentation*; D007909:Lenses; D061351:Telescopes