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| Call for Papers>>Final Program |
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| Abstract of admission as follows: |
| Volume Hologram for Display Using Photopolymers Sensitized to Dual-Wavelengths |
| Shiquan Tao |
| Abstract |
| Volume holograms recorded in thick materials exhibit good angle selectivity and wavelength selectivity, which can be used in holographic display, especially in real-color holograms, if the material is sensitive to multiple wavelength bands. In this paper the material is an novel epoxy-photopolymer composite material prepared by combining acrylate monomers or vinyl monomers as recording media with a liquid epoxy resin and an amine hardener as binder, originally designed for minimizing shrinkage in dense holographic data storage. It is a kind of self-development material; no wet process is needed after holographic exposure. More attentions were paid to sensitizers. A newly synthesized dye, DEAMC, showed higher photosensitizing activity than BDEA, a traditional photosensitizer widely used in photopolymers. Moreover, another dye, BTCP, was designed for improving the spectral response in broadband of wavelengths. A series of samples with different thickness were prepared by adjusting components. Their maximum diffraction efficiencies, sensitivity, and volumetric shrinkage were studied in holographic experiments with 457 nm or 532 nm laser beams. It shows that high diffraction efficiency together with high sensitivity and low shrinkage are obtained by combination of N-vinyl carbazole monomer with aliphatic epoxy resin and with DEAMC as sensitizer dye. This combination is potential for high density holographic storage with blue laser light. On the other hand, BCTP exhibited excellent holographic properties at dual wavelength 457nm and 532nm, when included in the photopolymer composites as sensitizer. The relatively large shrinkage (~1%), which may limit the material to use in high-density data storage, is less significant in display use. It is possible to record dual-wavelength hologram simultaneously in this photopolymer using a co-axial optical system. The 3-D image can be reconstructed from the hologram using white light without color-blurring, owing to the wavelength filtering effect of volume holograms. Experimental research is in progress. |
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