Reconstruction of parasitic holograms to characterize photorefractive materials |
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Authors: | MA Ellabban RA Rupp M Fally |
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Institution: | Institut für Experimentalphysik, Universit?t Wien, Strudlhofgasse 4, 1090 Wien, Austria, AT
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Abstract: | Photoinduced light scattering is a serious drawback that limits the applicability of thick holographic recording media but
provides valuable information on the recording medium. As long as there is no correlation between the scattering centers in
the crystal, photoinduced light scattering may be explained to result from the interference pattern of the incident beam and
the field scattered from a single point-like scattering center. The hologram of this ellipsoidally scattered wave field will
have practically the same structure in the reciprocal space modified by a response function which reflects the anisotropic
properties of the recording medium. We studied photoinduced light scattering in LiNbO3:Fe, a model system for photorefractive materials. The transmitted intensity in the stationary state of the scattering process
is investigated as a function of the reconstruction angle at different wavelengths and polarizations of the reconstructing
beam. The experimental results are analyzed by a simple phenomenological model based on the Ewald construction and can be
used to choose suitable conditions at which holographic scattering can be minimized as well as to extract some physical parameters
of the crystal.
Received: 27 September 2000 / Revised version: 1 December 2000 / Published online: 21 February 2001 |
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Keywords: | PACS: 42 40 -i 42 25 Fx |
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