8 September 2006 Dichromated agar: a promising doped biocopolymer for real time holographic recording
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Proceedings Volume 6343, Photonics North 2006; 63432U (2006) https://doi.org/10.1117/12.707774
Event: Photonics North 2006, 2006, Quebec City, Canada
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.
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Michèle Bolte, Michèle Bolte, Yaël Israëli, Yaël Israëli, Agnès Rivaton, Agnès Rivaton, Roger A. Lessard, Roger A. Lessard, } "Dichromated agar: a promising doped biocopolymer for real time holographic recording", Proc. SPIE 6343, Photonics North 2006, 63432U (8 September 2006); doi: 10.1117/12.707774; https://doi.org/10.1117/12.707774

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