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Proceedings Paper

Dichromated agar: a promising doped biocopolymer for real time holographic recording
Author(s): Michèle Bolte; Yaël Israëli; Agnès Rivaton; Roger A. Lessard
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Paper Abstract

Agar is a natural polysaccharide which, when doped with dichromate ammonium, can be considered as a promising light sensitive material used for real time hologram recording. The volume transmission gratings were recorded with a Kypton laser at 413 nm and they were read in real-time with a He/Ne laser at 632.8 nm contrary to dichromated gelatin. The so obtained holograms formed were phase holograms due to a refraction index modulation. The optimisation of chemical and physical parameters was investigated in order to form high quality holograms. It was demonstrated the crucial role played by the remaining water in the final film on the value of the diffraction efficiency. In the optimal conditions, a maximum diffraction efficiency of 37 % was attained. Both on-off experiments and the storage of the exposed materials at room temperature and in the dark reveal that the holograms were stable. An attempt to rationalize the set of results in terms of chemical structure of the polymeric matrix and of its ability to stabilize chromium (V) is presented.

Paper Details

Date Published: 8 September 2006
PDF: 12 pages
Proc. SPIE 6343, Photonics North 2006, 63432U (8 September 2006); doi: 10.1117/12.707774
Show Author Affiliations
Michèle Bolte, Lab. de Photochimie Moléculaire et Macromoléculaire, Univ. Blaise Pascal, CNRS (France)
Yaël Israëli, Lab. de Photochimie Moléculaire et Macromoléculaire, Univ. Blaise Pascal, CNRS (France)
Agnès Rivaton, Lab. de Photochimie Moléculaire et Macromoléculaire, Univ. Blaise Pascal, CNRS (France)
Roger A. Lessard, Univ. Laval (Canada)


Published in SPIE Proceedings Vol. 6343:
Photonics North 2006
Pierre Mathieu, Editor(s)

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