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Mémoires holographiques microstructurées à réseaux de Lippmann

Guillaume Maire 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Manolia
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : Holographic data storage is presently very promising to strongly increase the capacities and data rates of removable optical memories. The architecture of holographic memory targeted in the long term by the present work consists in a data layer that is structured into a matrix of microfibers set perpendicular to the disk surface. Holograms are Bragg gratings that are wavelength multiplexed in each microfiber. The targeted storage medium is a photopolymer doped with bistable molecular centers : the photopolymer is used for the microfiber structuration and the bistable centers for the grating recording. The influence of the discrete distribution of the centers and of the non-linearity of their optical response on the readout signal to noise ratio has firstly been estimated thanks to preliminary modeling work. Besides, a recording-readout procedure based on a Lippmann type configuration has been defined so as to simplify the memory architecture and increase the readout signal thanks to a homodyne detection of the holograms. The practical implementation of this procedure has been studied afterwards thanks to two experimental recording-readout setups. The first one has led to a demonstration of the procedure in a simplified configuration, limiting the difficulties arising from the recording material and geometry, that shows good agreement with our theoretical model. The results obtained have then been used to build a second setup to validate our procedure in a more realistic configuration involving a photopolymer as storage medium.
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  • HAL Id : tel-00584355, version 1

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Guillaume Maire. Mémoires holographiques microstructurées à réseaux de Lippmann. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00584355⟩

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