Improved multiplexing density in volume holographic memories through beam apodization

Brian M. King; Mark Allen Neifeld; Xuewen Chen

doi:10.1117/12.386816

24 May 2000 Improved multiplexing density in volume holographic memories through beam apodization

Brian M. King, Mark Allen Neifeld, Xuewen Chen

Proceedings Volume 4089, Optics in Computing 2000; (2000) https://doi.org/10.1117/12.386816
Event: 2000 International Topical Meeting on Optics in Computing (OC2000), 2000, Quebec City, Canada

Abstract

Volume holographic memories (VHM) achieve large storage capacities by multiplexing many holographic data pages in a small volume. On retrieval, a reference beam addresses the optical memory reconstructing the desired hologram with a large diffraction efficiency. In addition, all the other multiplexed holograms also reconstruct at a very low diffraction efficiency as determined by the Bragg selectivity function (BSF) of the VHM. To achieve low crosstalk the multiplexing scheme stores pages on the periodic nulls of the BSF. Absorption in the crystal corrupts the nulls requiring an increased multiplexing spacing between pages. Analysis of grating formation in photorefractive crystals relates the BSF to the transverse spatial electric field of the reference beam. This permits apodization of the reference beam as a method to shape the Bragg selectivity function and hence control the crosstalk noise. Furthermore, apodization can be incorporated into the VHM system metric, M/#, by considering the adjusted recording slope and reconstruction illumination. Theoretical predictions show that apodization can strongly attenuate the crosstalk noise allowing high multiplexing density in exchange for a small loss in the system M/#.

Citation Download Citation

Brian M. King, Mark Allen Neifeld, and Xuewen Chen "Improved multiplexing density in volume holographic memories through beam apodization", Proc. SPIE 4089, Optics in Computing 2000, (24 May 2000); https://doi.org/10.1117/12.386816

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