Head: Dr. Néstor Bolognini         Dr. Roberto Torroba Members:                   •Dra. Myrian Tebaldi                   •Dr. Alberto Lencina                   •Dra. Dafne Amaya Robayo                   •Lic. Gustavo Forte (Colaborator)                   •Ing. Luisa Cabezas

History

Work topics

• Development of dynamic holography techniques.
• Implementation of optical correlators for image identification by volume holography in photorefractive media.
• Implementation of joint correlators by all-digital techniques.
• Development of methods for validation, encryption y and decoding of information by using digital image processing techniques.
• Optical arrangements of multiple encryption by using photorefractive crystals.
• Design of new random phase masks for their application in the field of encryption and/or information validation to generate access hierarchy.
• Study of speckle distributions record in volumetric media.(photorefractive crystals).
• Study of holographic filters fixed in ferroelectric crystals.
• Characterization of materials using white light speckle methods.
• VOIS develompemt (Virtual Optics Imaging Systems).
• Study and application of acromatic processors.
• Study of cluster speckle distributions.
• Angular momentum of light.
                         
                                                  Cluster de speckle simulation

The most relevant works

• Limits of the paraxial approximation in aser beams.
  P. Vaveliuk, B. Ruiz and A. Lencina
  Opt. Lett. 32, 927-929 (2007)
• Dynamic of speckle cluster formation
  A. Lencina, M. Tebaldi,P. Vaveliuk, N. Bolognini
  W. Rand. Comp. Med. 17, 29-42 (2007)
• Multiplexing encrypted data by using polarized light.
  J. F. Barrera, R. Henao, M. Tebaldi, N. Bolognini, R. Torroba
  Opt Commun 260, 109-112 (2006)
• Multiple image encryption using an aperture-modulated optical system
  J. F.  Barrera, R. Henao, M. Tebaldi, N. Bolognini, R. Torroba
  Opt Commun 261, 29-33(2006)
• Wave propagation and optical properties in slabs with light-induced free-charge-carriers
  A. Lencina, P. Vaveliuk, B. Ruiz, M. Tebaldi, N. Bolognini
  Physical Review E 74, 056614-1;056614-9 (2006)
• Optical encryption method using toroidal zone plates
  J. F. Barrera, R. Henao and R. Torroba
  Opt. Commun. 248, 35-40(2005)
• Speckle interferometric technique to assess soap films
  M. Tebaldi, L. Ángel, N. Bolognini, M. Trivi
  Opt. Commun. 229, 29-37 (2004)
• Fixing of speckle distribution recorded in LiNbO₃crystals
  M. Tebaldi, N. Bolognini, L. Arizmendi
  Opt. Commun. 234, 43-51(2004)
• Phase-object detection by use of a double-exposure fringe modulated speckle patterns
  M. Tebaldi, L. Angel, M. Trivi, N. Bolognini
  J. Opt. Soc. Am. A 20, 116-129(2003)
• Experimental study of volume speckle in four-wave mixing arrangement
  A. Salazar, M. Tebaldi, N. Bolognini
  Opt. Commun. 221, 249-256(2003)
• Modulated speckle simulations based on the Random-walk model
  A. Lencina, P. Vaveliuk, M. Tebaldi, N. Bolognini
  Opt. Let. 28, 1748-1750 (2003)
• Phase object analysis with a speckle interferometer
  L. Angel, M. Tebaldi, M. Trivi, N. Bolognini
  Opt. Let.27, 506–508 (2002)

Collaboration with other institutions and Research groups

• Universidad EAFIT, Medellín (Colombia).
• Universidad de Antioquia, Medellín (Colombia).
• Fundação Visconde de Cairu (Brasil).
• Universidad Autónoma de Madrid, Madrid (España).
• Universidad Jaume I, Castellón (España).

Available equipment

• Antivibration tables.
• Antivibration  tables Nd: YAG CW 532 nm, 150 mW; He-Ne, 30 mW.
• Láseres de He-Ne.
• Photorefractive crystals: ferroelectric (LiNbO3); and sillenite (BSO, BGO, BTO)
• Spatial light modulators.
  
                                      

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