ENHANCEMENT OF MULTIPLEXED HOLOGRAMS IN CERIUM-DOPED SR0.75BA0.25NB2O6

A significant enhancement in the diffraction efficiency of multiplexed holograms recorded in cerium-doped Sr0.75Ba0.25Nb2O6 was achieved by applying a negative electrical pulse prior to recording and a positive electrical pulse after recording. The enhancement is characterized by the striking appearance of two distinct erasure time constants induce d by the depoling effects of the negative electric field pulse. An exp osure time schedule that takes into account the two erasure time const ants was derived and applied to obtain uniform diffraction efficiency of multiplexed holograms.