When multiple holograms are recorded in a photorefractive crystal, the recording of recent holograms erases early ones. We can equalize the strengths of all recorded holograms by following an appropriate exposure schedule. However, this leads to a composite hologram whose strength decreases as the number of exposures increases. In this paper, we describe a system in which the composite photorefractive hologram reaches a steady state with overall efficiency independent of the number of holograms (N). Furthermore, the phases of the recorded holograms remain locked during this process.

© 1991 Optical Society of America

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