<title>High-density photopolymer-based spatially multiplexed multiwavelength programmable memory</title>

Abstract

In this paper, a new scheme to implement high-density photopolymer-based spatially multiplexed multiwavelength programmable holographic memory is proposed. Two approaches are considered. The first is to implement programmable massive fanout beams based on an electrooptic grating array and the second is aimed at providing a multiwavelength high density memory by obtaining a smaller holographic memory spot at the proposed off- focal plane location. In the first approach, the diffraction efficiency of the electrooptically modulated grating is optimized, and 32.5% +/- 2.5% modulation efficiency is achieved under an applied voltage of 100 volts. In the second approach, the storage density is improved by 100 approximately 110% when compared with that obtained at the focal plane after Fourier transform. All the experimental results agree well with the theoretical predictions. A memory density of 100 pages/mm<SUP>2</SUP> is feasible using the reported scheme.