Abstract

4F lens designs are optimized for parallel access to volume holographic memories. Aberrations, diffraction, and component tolerancing are considered for their impact on parallelism, crystal information density, and overall system storage density. We find that a parallelism of ≥105 bits per page and a crystal information density of ≈2 Mbits/mm3 are achievable with standard optical elements and that advanced designs offer significant improvements. Crystal surface tolerance measurements show that a diffraction-limited performance is achievable over apertures of 7.1 mm for LiNbO3 and 1.5 mm for KNSBN(60). Lens-tolerancing simulations show that lens decenter degrades peak parallelism and peak crystal information density. Anew nonconfocal 4F system design with improved performance is presented.

© 1996 Optical Society of America

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