High-Density Optical Storage with Multiplexed Holographic Recording Method

概要

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Theoretical and experimental results are presented for angle-multiplexed and wavelength-multiplexed holographic recording. The recording medium is a cerium doped Sr_lt1-xgtBa_xNb_2O_6 (SBN) single crystal, and the light sources are a laser diode excited second harmonic generation (SHG) laser and a tunable laser diode. The SBN single crystal has high recording sensitivity, high diffraction efficiency and high temperature stability. The laser diodes miniaturize the holographic recording system. Crosstalk between hologram pages is theoretically calculated by using modified coupled-wave equations, and is also experimentally measured. The experimental results agree well with the theoretical results. Two-dimensional alphabetical character images are recorded using angle- and wavelength-multiplexed holographic methods, and are successfully reconstructed. The theoretical results indicate that several hundred multiplexed holograms can be recorded with little crosstalk using the proposed system. This multiplexed holographic recording technique will enable high-density recording and high data-transfer rates.
社団法人電子情報通信学会の論文
1995-11-25