Cancelamento de aberrações ópticas utilizando feixes de correlação

• Ano de defesa: 2015
• Autor(a) principal: Luisa Amorim Perez Filpi
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Física; Ótica; Aberração (Otica); Conversão paramétrica descendente; Campo eletromagnético
• Link de acesso: http://hdl.handle.net/1843/BUBD-AA8FT6

Optical imaging systems usually introduce wavefront deformation, the so called aberrations, which result in image degradation. In general, optical aberrations can be minimized with suitable combination of lenses or with specially designed lenses to correct certain kinds of aberrations. In this work, we deal with an alternative method for minimizing aberrations, one that employs fourth order detection of photons eneratedby the process of spontaneous parametric down conversion in a non-linear crystal. After a brief description of aberrations and the formation of correlation beams, we present an optical system capable of eliminating correlations introduced by wavefront deformation that are antisymmetric with respect to the system's axis of symmetry. We also present experimental data that conrm the theoretical predictionsand numerical simulations that establish limits for the validity of the proposed method.