Special phase mask and related data format for page-based holographic data storage systems |
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Authors: | Frank Przygodda Joachim Knittel Oliver Malki Heiko Trautner Hartmut Richter |
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Institution: | 1. Deutsche Thomson OHG, Hermann-Schwer-Str. 3, D-78048, Villingen-Schweningen, Germany
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Abstract: | Random phase masks in object and reference beam of page-based holographic storage systems suppress the DC-peak and improve
the overlap of both beams inside the storage material. Furthermore, they allow for a narrow shift-selectivity. In a holographic
setup the phase mask has to be introduced at a conjugate image plane of the spatial light modulator (SLM), if it is not fixed
directly on the SLM itself. A binary phase mask with cells generating 0 and π phase shifts has to be aligned very accurately
with respect to the SLM pixels, otherwise image artifacts disturb the received data page. We present a phase mask, where the
phase cells have the size of a data block which consists of a rectangular set of SLM pixels. Additionally, the corresponding
data page has no data at the position of phase jumps and thus relaxes the alignment tolerance significantly. |
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