3 June 2002 Rotation-angularly multiplexed holographic memory system using moving window and double-focusing lens
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Abstract
A new rotation-angularly multiplexed holographic memory system by using moving window and double-focusing lens (DFL) is proposed, in which crosstalk due to two neighboring moving window rows in the vertical direction of the conventional moving window (MW) holographic memory system can be overcome. That is to say, in the proposed method, crosstalk in the vertical direction can be eliminated by combined use of the DFL, which has periodical curvature of radius R1 and R2 with different focal lengths F1 and F2, respective, and moving windows on the LCD spatial light modulator. Light beams form curvature of radius R1 and R2 parts of double-focusing lens are focused at F1 and F2 locations, respectively, to occur different reference wave vectors Kr and Kr. By such shift multiplexing effect, crosstalks due to two neighboring MW rows in the vertical direction on the reconstruction can be eliminated. By combining the proposed multiplexing method with rotating disc-type photopolymer, it is possible to achieve the high- density storage capacity compared with the conventional holograph memory system and its feasibility is demonstrated through optical experiments.
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Byung-Chul Cho, Byung-Chul Cho, Hong-Bay Chung, Hong-Bay Chung, Eun-Soo Kim, Eun-Soo Kim, } "Rotation-angularly multiplexed holographic memory system using moving window and double-focusing lens", Proc. SPIE 4659, Practical Holography XVI and Holographic Materials VIII, (3 June 2002); doi: 10.1117/12.469269; https://doi.org/10.1117/12.469269
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