Regensburg 2007 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 11: Poster Session

DF 11.19: Poster

Donnerstag, 29. März 2007, 14:30–18:00, Poster C

Parametric hybrid scattering on photorefractive gratings and light-induced ferroelectric structures — •Andreas Selinger, Volker Dieckmann, and Mirco Imlau — Department of Physics, University of Osnabrück, Barbarastr. 7, D-49069 Osnabrück, Germany

We report on a special type of photo-induced parametric light scattering in iron-doped lithium niobate which manifests itself as a polarization-anisotropic elliptical light pattern. It appears as a part of the entire photo-induced scattering pattern which can be induced by a single pump beam. The geometry and intensity of the kinetics of the elliptical pattern are analyzed in respect to beam fanning, the polarization-anisotropic scattering cone, and light scattering from photo-induced microdomains appearing simultaneously. We show that both photorefractive gratings and light-induced ferroelectric structures contribute to the elliptical scattering. Moreover, it is shown experimentally that the light of the participating scattering processes shows intensity oscillations in the steady state with particularly defined frequencies. This allows us to assign the amplification processes yielding the respective scattering pattern to frequency detunings. An Ewald construction is presented to define the corresponding phase-matching conditions. Financial support by the DFG (projects IM 37/2-2, GRK 695).