Se ocupa de la generación de conocimientos, con proyección hacia la implementación y desarrollo de métodos y tecnologías ópticas, que respondan a las necesidades científicas, académicas y tecnológicas del medio. La actividad del grupo se desarrolla mediante proyectos que propician la interacción con campos de la ingeniería y sectores productivos.

Coordinador: René Restrepo Gómez
Email: rrestre6@eafit.edu.co
Area: Ciencias y Humanidades

Collections in this community

Recent Submissions

  • Speckle interferometric technique to assess soap films 

    Ángel Toro, Luciano; Bolognini, Néstor Alberto; Tebaldi, Myrian Cristina; Trivi, Marcelo Ricardo (Elsevier B.V., 2003-10-17)
    An speckle interferometric technique to monitor the thinning process of vertical soap film before the film rupture is presented -- The interferometric arrangement consists in a double aperture pupil optical system which ...
  • Analysis of vibrations in a plate using interferometric methods 

    Ángel-Toro, Luciano; Prieto, Daniel Velasquez; Rueda Muñóz, Edgar Alberto (SPIE; Grupo de Investigación de Óptica Aplicada; Escuela de Ingeniería, 2004-10-21)
    In this work some frequencies and modes of vibration of a thin plate were determined using interferometric methods like: real-time holographic interferometry, time-average holographic interferometry, digital speckle pattern ...
  • Double aperture speckle method using a BSO crystal for in plane displacement 

    Trivi, Marcelo Ricardo; Tebaldi, Myrian Cristina; Bolognini, Néstor Alberto; Ángel Toro, Luciano (SPIE, 1999-07-06)
    The possibility of using a BSO crystal as a recording medium of specklegrams with carrying frequency fringes, to storage multiple interferograms, for uniform in-plane displacements, is presented. Experimental results are ...
  • DC term filtering techniques in digital holography 

    Velásquez-Prieto, Daniel; García Sucerquia, Jorge Iván; Herrera Ramírez, Jorge Alexis (SPIE; Grupo de Investigación de Óptica Aplicada; Escuela de Ingeniería, 2004-10-21)
    In numerical hologram reconstruction like in optical holography, there exist different diffraction orders, which many times produce difficulties for the image visualizations. In numerical reconstruction, the filtering of ...
  • Contrast inversion in the Lau phenomena implemented with a photorefractive grating 

    Ángel Toro, Luciano; Tebaldi, Myrian Cristina; Bolognini, Néstor Alberto (SPIE, 1999-07-06)
    It was implemented the Lau effect with a grating registered in a BSO crystal. Two different arrangement were analyzed. In both cases, it is possible to control the visibility and to produce the contrast inversion of fringes, ...
  • Speckle photography with different pupils in a multiple-exposure scheme 

    Ángel Toro, Luciano; Bolognini, Néstor Alberto; Tebaldi, Myrian Cristina; Trivi, Marcelo Ricardo (Optical Society of America, 2000-01-01)
    The use of different multiple-aperture pupils for recording each image in speckle photography is proposed -- The introduction of suitable spatial frequency carriers, by internally modulating imaged speckles, allows one to ...
  • Speckle photography through different multiaperture pupils 

    Ángel Toro, Luciano; Tebaldi, Myrian Cristina; Bolognini, Néstor Alberto; Trivi, Marcelo Ricardo (SPIE/ 18th Congress of the International Commission for Optics, 1999-07-19)
    An image multiplexing method based on the internal modulation of speckle grains by employing different multiple aperture pupils for recording is proposed. The interferometric fringes profile and visibility in the Fourier ...
  • Reduction of speckle noise in digital holography 

    Velásquez-Prieto, Daniel; García Sucerquia, Jorge Iván; Castañeda Sepúlveda, Román; Herrera Ramírez, Jorge Alexis (SPIE; Grupo de Investigación de Óptica Aplicada; Escuela de Ingeniería, 2004-10-21)
    A fundamental problem in holography, as well optical as digital, is the presence of speckle noise in the reconstruction process -- Many approaches have been carried out in order overcome such a problem, ranging from altering ...
  • 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 ...
  • Obtención de estructuras de relieve en materiales de registro de haluros de plata 

    Velásquez Prieto, Daniel; Giraldo Castaño, Lady Marcela (Sedoptica; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2013-09-19)
    Diffraction transmission gratings were recorded in AGFA-8E75 film, chemically treated under processes with D-19 + potassium ferrocyanide and a chemical processing technique proposed for PE-2 film to obtain embossed stripes. ...
  • Phase-difference images by digital holography applied to 3D surface contouring 

    Velásquez-Prieto, Daniel; García Sucerquia, Jorge Iván (Academia Colombiana de Ciencias Exactas Físicas y Naturales; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2005-06)
    The problem to determine the 3D-contour of objects with all sizes and shapes is a hot topic in diverse fields of optical research and engineering. Through the use of the numerical reconstruction of digital recorded holograms, ...
  • Shack - Hartmann spot dislocation map determination using an optical flow method 

    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 ...
  • Evaluation between methods for the color measurement in holograms by using a CMOS-RGB camera and a spectrometer 

    Palacios Ortega, Natalith; Velásquez Prieto, Daniel (SPIE; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2013-07-22)
    Many models and methods commonly used in colorimetry have been incorporated to the study and knowledge of the colorimetric properties in the reflection color holograms; these methods have reported the possibilities of color ...
  • Improvement of the signal-to-noise ratio in digital holography 

    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 ...
  • Design of a control system for interferometric fringe stabilization system with remote access 

    Espitia-Gómez, Javier; Ángel Toro, Luciano; Velásquez Prieto, Daniel (SPIE; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2013-11-18)
    Stability in a fringe pattern is a necessary condition in interferometric processes, such as holography, and not always is enough the use of passive stabilization systems, like holographic tables, in particular, when ...
  • Three-dimensional contouring with digital holography 

    Velásquez-Prieto, Daniel; García Sucerquia, Jorge Iván (Sociedad Colombiana De Física; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2005-04-28)
    We report on a technique to determine the 3D contour of objects with dimensions of at least four orders of magnitude larger than the illumination optical wavelength. Our proposal is based on the numerical reconstruction ...
  • Three-dimensional surface contouring of macroscopic objects by means of phase-difference images 

    García Sucerquia, Jorge Iván; Velásquez Prieto, Daniel Ignacio (OSA; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2006-04-16)
    We report a technique to determine the 3D contour of objects with dimensions of at least 4 orders of magnitude larger than the illumination optical wavelength. Our proposal is based on the numerical reconstruction of the ...
  • Multiple-aperture speckle method applied to local displacement measurements 

    Ángel-Toro, Luciano; Tebaldi, Myrian; Bologninic, Néstor (Elsevier B.V; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2007)
    The goal of this work is to analyze the measurement capability of the modified speckle photography technique that uses different multiple aperture pupils in a multiple exposure scheme. In particular, the rotation case is ...
  • Photorefractive optical processing: some proposals 

    Ángel-Toro, Luciano; Bolgnini, Néstor; Tebaldi, Myrian (SPIE; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 1999-04-29)
    Some proposals on Lau and Talbot fringes formation based on a grating registered as birefringence modulation in a photorefractive crystal, will be presented. In the Talbot case, the stored grating can be replicated if ...
  • Propierties of speckle patterns generated through multiaperture pupils 

    Ángel-Toro, Luciano; Tebaldi, Myrian; Trivi, Marcelo; Bolognini, Néstor (Elsevier; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2001-05-15)
    The characteristics of the image speckles obtained through multiple aperture pupils are theoretically analyzed in terms of the parameters defining the pupils. The possibility of interpreting and synthesizing the image ...

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