A coherent optical data-processing method based on volume holographic correlator is described, which has the potential
for performing Walsh transform at a high processing rate. The input image and stored images of volume holographic
correlator are encoded to represent the data vector and Walsh functions in Walsh transform. And the output of volume
holographic correlator can represent the result of Walsh transform. An experiment is carried out, and the correspondency
of experimental result and theoretical one proves the effectiveness of the method.
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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