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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