Publication: A photopolymerizable glass with diffraction efficiency near 100% for holographic storage
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2001-03-12
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Cheben, Pavel
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Amer Inst Physics
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Abstract
Permanent holographic storage has been demonstrated in a photopolymerizable organically modified silica glass. The glass was prepared by dispersing a titanocene photoinitiator and a high refractive index acrylic monomer in a porous silica matrix. This glass exhibits unprecedented sensitivity and refractive index change upon a moderate exposure to green light and can be fabricated in thickness up to several millimeters. A photopolymerizable storage medium of such a thickness with good holographic properties is needed for practical holographic storage devices. Lack of such medium has been considered the main obstacle in development of write-once holographic memories. In our glass, we have stored permanent volume holograms of diffraction efficiency approaching 100% and refractive index modulation up to 4.5 x 10(-3), making this photopolymerizable material suitable for use in holographic data storage.
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© 2001 American Institute of Physics.
One of the authors (P.C.) would like to thank D. J. Carlsson, J. D. Worsfold, and F. del Monte for stimulating discussions. They also thank the Rectorate of the Complutense University for facilitating this work.
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