Holographic Recording and Parametric Scattering Due to Orthogonally Polarized Beams in BaTio sub 3,
OSNABRUECK UNIV (GERMANY F R) FACHBEREICH PHYSIK
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Among the variety of photorefractive crystals barium titanates distinguishes by its large nondiagonal electrooptic coefficient tau sub 42 16OOpmV which enables efficient anisotropic diffraction. We report the first observation of anisotropic selfdiffraction from gratings arising in BaTiO3 when two copropagating orthogonally polarized waves ordinary and extraordinary impinge in the crystal at an arbitrary angle in the plane perpendicular to the optical axis and discuss the possible origins of this effect. A nominally pure BaTiO3 single crystal of dimensions 6.6 x 4.4 x 2.6mm is used. Two expanded beams of an argon laser lambda 515nm intersect inside the sample with the c-axis directed normally to the plane of incidence Fig. 1 both beams have nearly equal intensities total intensity approx. 6.5kWM-2.