• Improvement of the signal-to-noise ratio in digital holography 

    Velásquez-Prieto, Daniel; Herrera Ramírez, Jorge Alexis; García Sucerquia, Jorge Iván; Velásquez-Prieto, Daniel; Herrera Ramírez, Jorge Alexis; García Sucerquia, Jorge Iván (Sociedad Mexicana de Física; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2005-02)
    A fundamental problem in optical and digital holography is the presence of speckle noise in the reconstruction process, which essentially diminishes the signal to noise ratio (SNR). For many applications, that reduction ...
  • Shack - Hartmann spot dislocation map determination using an optical flow method 

    Vargas, Javier; Restrepo Gómez, René; Belenguer, Tomás; Vargas, Javier; Restrepo Gómez, René; Belenguer, Tomás (OSA; Escuela de Ciencias y Humanidades, 2014-01-14)
    We present a robust, dense, and accurate Shack-Hartmann spot dislocation map determination method based on a regularized optical flow algorithm that does not require obtaining the spot centroids. The method is capable to ...
  • Talbot and Lau phenomena implementation via a photorefractive converter 

    Tebaldi, Myrian Cristina; Ángel Toro, Luciano; Bolognini, Néstor Alberto (SPIE, 1999-07-06)
    We propose a novel implementation of the Lau and Talbot effects. It employs a grating registered as modulation of birefringence in a Bi12SiO20 crystal. The systems proposed allow to control the visibility and in particular ...