Optical EngineeringMassive parallel optical pattern recognition and retrieval via a two-stage high-capacity multichannel holographic random access memory system
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The multistage holographic optical random access memory (HoRAM) system reported recently by Liu et al. provides a new degree of freedom for improving storage capacity. we further present a theoretical and practical analysis of the HoRAM system with experimental results. our discussions include the system design and geometrical requirements, its applications for multichannel pattern recognition and associative memory, the 2-D and 3-D information storage capacity, and multichannel image storage and retrieval via VanderLugt correlator (VLC) filters and joint transform holograms. A series of experiments are performed to demonstrate the feasibility of the multichannel pattern recognition and image retrieval with both the VLC and joint transform correlator (JTC) architectures. The experimental results with as many as 2025 channels show good agreement with the theoretical analysis.