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ABSTRACT: We report the observation of a self-written waveguide inside a bulk methylene blue sensitized poly/vinyl alcohol)/acrylamide photopolymer material. Light from a low power He-Ne laser is focused into the material, and the evolution of the beam is monitored. The refractive index of the material is modulated in the region of high intensity due to photobleaching and photopolymerization effects occurring in the material. As a result, the beam propagates through the medium without any diffraction effects.
Applied Optics 01/2009; 47(35):6502-7. · 1.41 Impact Factor
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ABSTRACT: The effect of chromium doping on methylene blue sensitized Poly (vinyl alcohol)/Acrylamide was carried out by varying the
ratios of Ammonium dichromate and methylene blue. In the case of films without ammonium dichromate, the diffraction efficiency
was found to decrease on storage. On chromium doping the storage life was improved. Interestingly, a self-enhancement in efficiency
was observed for a particular ratio of methylene blue and ammonium dichromate.
Journal of Materials Science Materials in Electronics 12/2008; 20:216-220. · 1.08 Impact Factor
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ABSTRACT: The diffraction efficiency, sensitivity, and storage life of methylene blue-sensitized poly(vinyl chloride) film was improved by the addition of an electron donor in the matrix. The addition of pyridine enhanced the diffraction efficiency by two times, and storage life of the gratings was increased to 2-3 days.
Applied Optics 02/2007; 46(3):346-50. · 1.41 Impact Factor
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ABSTRACT: A new photopolymerizable recording media is introduced based on poly (vinyl alcohol) and vinyl acetate sensitized with methylene blue. It is observed that this MBPVA/VAc system can be reused a number of times without significant decrease in diffraction efficiency. The PVA-VAc ratio was optimized at 2:1. Diffraction efficiency of 6.3% was obtained without any fixing at a dye concentration of 9.3 × 10−4 mol/l at an exposure of 750 mJ/cm2. The material is attractive on account of its reusability.
Journal of Modern Optics 02/2006; 53(3):343-355. · 1.17 Impact Factor
