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