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Analysis of reflection speckle holograms in a BSO crystal |
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| Authors: | Ángel Salazar Héctor Lorduy Myrian Tebaldi Nestor Bolognini |
| Institution: | a Grupo de Óptica y Espectroscop?´a (GOE), Centro de Ciencia Básica, Universidad Pontificia Bolivariana, A. A. 56006, Cq 1 70-01, Laureles, Medell?´n, Colombia b Universidad Nacional de Colombia, Calle 59A, 63-20, Medell?´n, Colombia c Centro de Investigaciones Ópticas, CIOp (CONICET, CIC) and OPTIMO (Dpto. Fisicomatemática, Facultad Ingenier?´a, UNLP), Camino Centenario entre 505 y 508, P.O. Box 124, Gonnet, La Plata 1900, Argentina d Centro de Investigaciones Ópticas, CIOp (CONICET, CIC), OPTIMO (Dpto. Fisicomatemática, Facultad Ingenier?´a, UNLP) and Facultad Ciencias Exactas, UNLP, Camino Centenario entre 505 y 508, P.O. Box 124, Gonnet, La Plata 1900, Argentina |
| Abstract: | A theoretical and experimental study of speckle registering in photorefractive BSO crystals through reflection hologram geometry is implemented. The three-dimensional speckle nature is considered in the diffraction efficiency calculations. The interference process produces index-of-refraction gratings in the speckle volume via the photorefractive effect. It is demonstrated that the coupled-wave theory for reflection geometry allows explaining the diffraction efficiency behavior when the interaction length is properly taken into account. It means that the speckle depth is related with the interaction length. The speckle depth can be controlled by the imaging system pupil aperture diameter. Under this condition, the influence of the speckle depth on the diffraction efficiency is analyzed. An agreement between the numerical model based on the coupled-wave theory and the experimental results is obtained. |
| Keywords: | 42 30 Ms 42 40 Lx 42 40 Ht |
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