REFLECTION HOLOGRAMS IN IRON-DOPED LITHIUM-NIOBATE

An analysis of different geometries for the recording of reflection gr atings in photorefractive crystals of 3 m pointgroup with photovoltaic charge transport is presented. Several unusual optical geometries are proposed and analyzed in contrast to the traditional arrangement with two counterpropagating ordinary waves recording a grating in a Z-cut sample. Some of these schemes involve the recording of gratings by two eigenwaves with different polarizations and reconstruction of the obj ect wave with orthogonal polarization with respect to the reference wa ve; this allows noise reduction in holographic reconstruction by simpl e polarization filtering.