Holographic light scattering in centrosymmetric sodium nitroprusside upon generation of light- induced metastable states

Received 16 December 2005; published 22 May 2006The phenomenon of holographic light scattering in centrosymmetric crystals of sodiumnitroprusside isinvestigated by analyzing 1 the effect of light polarization and wavelength of pump- and readout beams, 2the angular intensity distribution, and 3 the kinetics of scattered light. It is shown that the scattering phe-nomenon and the corresponding properties can be entirely explained by diffraction processes of the pump beamfrom parasitically recorded slanted phase gratings without assuming any beam-coupling processes. The kineticsoriginates from the nonlinear photorefractive recording mechanism. Further we present an approach for three-wave interaction including diffraction processes at higher harmonics, that explains the temporal build-up ofwide-angle scattering in media with a nonlinear photorefractive response.DOI: 10.1103/PhysRevB.73.205113 PACS number s : 42.40. i, 42.65.Pc, 42.70.Ln, 78.35. c

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