• 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 ...
  • Features on photorefractive registered speckles 

    Ángel-Toro, Luciano; Bolognini, Néstor; Tebaldi, Myrian (SPIE; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 1999-04-29)
    The recording and read-out of a volume speckle pattern is investigated for transmission geometry. The modulation of the 3D speckle grains appears when the image of a coherently illuminated random diffusor is formed onto ...
  • Phase stepping in Lau interferometry 

    Ángel-Toro, Luciano; Tebaldi, Myrian; Henao, Rodrigo (Elsevier; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 1999-06-15)
    The implementation of phase shifting interferometry to analyze the Lau interferometric fringe patterns is proposed. The fundamentals of this application are theoretically discussed and the basis of the phase map interpretation ...
  • 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 ...
  • 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, ...
  • 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 ...
  • 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 ...
  • 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 with different pupils in a multiple-exposure scheme 

    Angel, L; Tebaldi, M; Bolognini, N; Trivi, M (OPTICAL SOC AMER, 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 ...
  • Optical processing by fringed speckles registered in a BSO crystal 

    Tebaldi, M.; Toro, L.A.; Trivi, M.; Bolognini, N. (SPIE, 2000-01-01)
    An alternative image multiplexing technique, employing a multiple-aperture pupil for each exposure, is presented. The aperture arrangement of the pupil is modified between exposures. A thick photo-refractive BSO crystal ...
  • Interpretación Cuantitativa de Interferogramas Holográficos por Medición de la Fase 

    Velásquez, Daniel Ignacio (Sociedad Colombiana de Física, 2000-01-01)
  • Optical processing by fringed speckles registered in a BSO crystal 

    Tebaldi, Myrian; Trivi, Marcelo; Bolognini, Néstor; Ángel-Toro, Luciano (SPIE; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2000-07-28)
    An alternative image multiplexing technique, employing a multiple-aperture pupil for each exposure, is presented. The aperture arrangement of the pupil is modified between exposures. A thick photorefractive BSO crystal is ...
  • New multiple aperture arrangements for speckle photography 

    Angel-Toro, Luciano; Tebaldi, Myrian; Trivi, Marcelo; Bolognini, Néstor (Elsevier B.V; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2000-08-01)
    Abstract. We propose a multiple exposure specklegram by using an optical system whose multiple aperture pupil changes between exposures. In particular, we analyze experimentally two arrangements and we show that it is ...
  • New multiple aperture arrangements for speckle photography 

    Tebaldi, M; Toro, LA; Trivi, M; Bolognini, N (ELSEVIER SCIENCE BV, 2000-08-01)
    We propose a multiple exposure specklegram by using an optical system whose multiple aperture pupil changes between exposures. In particular, we analyze experimentally two arrangements and we show that it is possible to ...
  • Double exposure specklegrams obtained by using scaled aperture pupils 

    Angel, L; Tebaldi, M; Trivi, M; Bolognini, N (SPIE-INT SOC OPTICAL ENGINEERING, 2001-01-01)
    In speckle photography the pupil aperture is usually not modified between exposures. In our work, the change of the pupil aperture scale between exposures is analysed on the basis of double-exposed image speckle, before ...
  • 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 ...
  • Properties of speckle patterns generated through multiaperture pupils 

    Angel, L; Tebaldi, M; Trivi, M; Bolognini, N (ELSEVIER SCIENCE BV, 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 ...
  • Recuperación de la energía radiada por conductores de corriente alterna 

    Marulanda, José Ignacio (Sociedad Colombiana de Física, 2001-06-01)
  • Logic operations by using modulated speckle 

    Tebaldi, Myrian; Ángel-Toro, Luciano; Trivi, Marcelo; Bolognini, Néstor (SPIE; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2001-08-14)
    An alternative image multiplexing technique is proposed. In the arrangement implemented, the input is imaged by introducing a multiple aperture pupil in the imaging lens. Then, the speckle pattern is modulated by several ...
  • Double exposure specklegrams obtained by using scaled aperture pupils 

    Angel-Toro, Luciano; Tebaldi, Myrian; Trivi, Marcelo; Bolognini, Néstor (SPIE; Grupo de Investigación de Óptica Aplicada; Escuela de Ciencias y Humanidades, 2001-08-14)
    In speckle photography the pupil aperture is usually not modified between exposures. In our work, the change of the pupil aperture scale between exposures is analyzed on the basis of double-exposed image speckle, before ...