QUASI-STABILIZED IONIC GRATINGS IN PHOTOREFRACTIVE MEDIA FOR MULTIPLEX HOLOGRAPHY

We investigate photorefractive media for which quasi-stabilized ionic gratings can be used to prolong readout lifetime. We use coupled-trans port-mode theory to describe the coevolution of photorefractive gratin gs that arise from free-electron transport and ionic transport. We eva luate in detail the differences between low-temperature and high-tempe rature recording for typical conditions required by multiplex holograp hy. We provide general normalized examples for simple diffusion transp ort and specific examples for photovoltaic LiNbO3. We introduce a comm on formalism to compare widely varying results present in the literatu re and to guide the materials and system development processes. (C) 19 97 Optical Society of America.