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Colloque
New self-developing reversible dye doped holographic photopolymer materials were recently developed in our laboratory, which are sensitive from the green to near infrared wavelengths (500-850 nm). Up to day, polymer dispersed liquid crystals were used in similar systems to increase the refractive index modulation. In this work we have shown, for the first time to our knowledge, that a new functionality of optical reconfiguration may be introduced if a reversible photosensitive dye is doped in the material. The present compound is a multifunctional acrylic based photopolymerizable material. Reversible dye and organic compound serve as solvent and refractive index increasing agents. …
Colloque
New self-developing reversible dye doped holographic photopolymer materials were recently developed in our laboratory, which are sensitive from the green to near infrared wavelengths (500-850 nm). Up to day, polymer dispersed liquid crystals were used in similar systems to increase the refractive index modulation. In this work we have shown, for the first time to our knowledge, that a new functionality of optical reconfiguration may be introduced if a reversible photosensitive dye is doped in the material. The present compound is a multifunctional acrylic based photopolymerizable material. Reversible dye and organic compound serve as solvent and refractive index increasing agents. …
Colloque
Holographic polymer dispersed liquid crystal materials with high sensitivity in the near IR are studied in details. Materials presented are based on mixture of an acrylate monomer, liquid crystal (LC) and are sensitized to 800 – 850 nm region. This allows highly efficient in-situ recording of holographic optical elements using infra red lasers. The holographic recording is realized by means of a Ti-Sa laser operating at 850 nm. High diffraction efficiency is demonstrated. Sensitivity of the material, dark-development and photochemical stability of the recorded gratings are investigated in the mentioned spectral range. The angular and spectral selectivities of gratings, recorded …
