Data storage on holographic memory card

Pal Koppa; Gabor Erdei; Ferenc Ujhelyi; Peter Varhegyi; T. Ujvari; Emoeke Loerincz; Gabor Szarvas; Soeren Hvilsted; P. S. Ramanujam; Peter I. Richter

doi:10.1117/12.402495

3 October 2000 Data storage on holographic memory card

Pal Koppa, Gabor Erdei, Ferenc Ujhelyi, Peter Varhegyi, T. Ujvari, Emoeke Loerincz, Gabor Szarvas, Soeren Hvilsted, P. S. Ramanujam, Peter I. Richter

Author Affiliations +

Proceedings Volume 4149, Holography 2000; (2000) https://doi.org/10.1117/12.402495
Event: Holography 2000, 2000, St. Poelton, Austria

Abstract

Our goal is to develop a re-writable holographic memory card system based on thin film polymer media on credit card size plastic carriers. Data is stored in our system in form of polarization holograms that present high efficiency and excellent suppression of higher orders even for thin material. Data is written on the card in a parallel way using spatial light modulators to encode the object beam that is Fourier transformed by a custom objective lens and interferes with the reference beam (of orthogonal polarization) on the card. We use reflective carrier in order to read out the data from the same side of the card. This allows us to have a compact system and standard ID 1 type carrier card. The optical system and the data organization are optimized to have a data density higher than 1bit/micrometers ². We expect to pass the limit of 10 bit/micrometers ² with the introduction of phase coded multiplexing that would provide more than 2Gbyte capacity if using half the card area as active surface.

Citation Download Citation

Pal Koppa, Gabor Erdei, Ferenc Ujhelyi, Peter Varhegyi, T. Ujvari, Emoeke Loerincz, Gabor Szarvas, Soeren Hvilsted, P. S. Ramanujam, and Peter I. Richter "Data storage on holographic memory card", Proc. SPIE 4149, Holography 2000, (3 October 2000); https://doi.org/10.1117/12.402495

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