Beam Conditioning Techniques for Holographic Recording Systems

Kostuk, Raymond K.; Artajona, Maria; Gao, Qiang

doi:10.1007/978-3-540-47864-5_15

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…However, binary absorption data pages produce highly inhomogeneous Fourier transforms, with a very energetic zero frequency in comparison with the higher frequencies, which carry most of the information of the signal. This high zero frequency may saturate the dynamic range of the material, thus producing a decrease in the signal to noise ratio in the reconstruction and limiting the accessible dynamic range 12 . Various alternative schemes have been proposed, such as recording the defocused FT (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Characterization and optimization of liquid crystal displays for data storage applications

et al. 2007

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We present the characterization and the optimization of the phase and amplitude modulation of a liquid crystal display (LCD) applied to holographic data storage. We discuss the main LCD modulation regimes demanded in the literature in the application to holographic memories: binary amplitude, binary phase and hybrid ternary modulation (HTM). We show how to obtain optimally these modulation regimes with a LCD. In our strategy it is essential the accuracy demonstrated by the model we use to describe the modulation properties of the LCD. This accuracy allows for a reliable computer search of the configurations enabling for an optimum LCD complex amplitude modulation. Results are given for the calibration of a commercial LCD. Optimum configurations close to the ideal for each of the modulation regimes are also obtained and the values of the various parameters characterizing the quality of these configurations are provided. We have also analyzed the performance of these configurations to perform the Fourier transform (FT) of a binary data page. We see that the optimum configurations obtained for the binary phase and the HTM regimes produce a homogeneous distribution of the energy in the Fourier plane with no DC peak.

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Section: Introductionmentioning

confidence: 99%

“…as associative memories, and lowers the storage density. Another alternative proposed is to use random or pseudo-random phase masks to uniformize the FT spectrum 12,13 . In this case the main drawback is the stringent requirements for optical alignment between the phase mask and the LCD with subpixel accuracy.…”

Section: Introductionmentioning

confidence: 99%