21 November 2007 Applications of phase masks in volume holographic data storage system and correlators
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Abstract
Effects of phase masks, used in content-addressable volume holographic data storage system, on the spectrum modulation, image reconstruction, and content search capability are analyzed. We have investigated the influence of varying the pixel structure of phase masks on Fourier-transform holographic recording and reconstruction errors. The effect on reconstruction errors of using a (0, π) two-level phase mask is studied. The case that a single pixel in the phase mask extended to cover four or more pixels in the spatial light modulator (SLM) is discussed. The reconstruction errors of a recorded binary data page and the field amplitude in the Fourier plane are evaluated when the phase mask is misaligned to the SLM. We have also investigated the performance of phase masks in terms of suppressing the diffraction sidelobes which lead to correlation cross talk and sharpening the correlation peaks. The results provide a useful support for the mask design, fabrication and applications in the practical content-addressable volume holographic data storage.
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Wei Ren, Qiang Ma, Liangcai Cao, Qingsheng He, Guofan Jin, "Applications of phase masks in volume holographic data storage system and correlators", Proc. SPIE 6827, Quantum Optics, Optical Data Storage, and Advanced Microlithography, 682710 (21 November 2007); doi: 10.1117/12.756388; https://doi.org/10.1117/12.756388
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KEYWORDS
Spatial light modulators

Fourier transforms

Holography

Holographic data storage systems

Data storage

Phase shift keying

Modulation

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