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4 January 2008 Analysis of a photopolymer sensitized by whole visible light for holographic storage
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A novel photopolymer based on polyvinyl-alcohol for holographic storage was fabricated. The material with riboflavin (RF), methylene bule (MB), erythrosin B (ErB) as the photosensitizers for holographic storage has a broad absorption spectrum range (more than 500nm). The photopolymer can be sensitized by the whole visible light, and that will improve storage capacity and density of the holographic storage greatly, especially under the short wavelength recording. Photo-induced reaction processes in the photopolymer and phase grating of index modulation for holographic storage were studied. The surface structure of the grating and the images of reaction processes were scanned by SEM (Scanning Electron Microscope). The experimental results are compared with the kinetics theory of the polymerization and they are fitted well. Furthermore, the grating constant can be estimated from grating images which were scanned by SEM. Some holographic characteristics of the photopolymer were analyzed. Using a standard holographic setup, we recorded unslanted diffraction gratings.The material has high maximum diffraction efficiency (≥68%), good sensitivity (≥3.03×10-3 cm2/mJ), and high index modulation (≥4.58 ×10-4) when its tickness is about 300μm. Two dimentional simulate images generated by SLM (Spatial Light Modulator) were stored in the film, and the reconstructed data pages had good fidelity. The results show that the material has a better potential in holographic storage.
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Ruoping Li, Sulian Wang, Hai Lu, Yong Xiao, Daoguang Tang, and Mingju Huang "Analysis of a photopolymer sensitized by whole visible light for holographic storage", Proc. SPIE 6832, Holography and Diffractive Optics III, 68322A (4 January 2008);

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