In this work, the effect of photoinitiator concentration and light intensity on conversion of trifunctional acrylate monomers is studied. Polymerization reaction and diffusion of acrylate monomers is examined using Real Time Infrared (RTIR) spectroscopy, differential scanning calorimetry and a holographic technique. An optimal initiator concentration that provides maximized diffraction efficiency is observed.
In this paper we report an experimental method to optimize diffraction efficiency and sensitivity of the grating in a photopolymer system using Real Time Infrared (RTIR) spectroscopy. Polymerization profiles were directly recorded, allowing a precise evaluation of the polymerization rate and the photosensitivity. The optimum chemical composition of the photopolymer system for recording high diffraction efficiency transmission gratings is experimentally obtained. Using the RTIR results and a photopolymerization-diffusion model we have further determined the basic kinetic and diffusion parameters of the photopolymer system.
Many devices using the electro-optic effect, in which the index of refraction changes upon application of an external electrical field, have been proposed to control the propagation of light in planar waveguides. Some electro-optic waveguides are made from polymers materials. However, none of them has the circular symmetry of optical fibers. Therefore the connection between optical fibers and planar waveguides is a difficult and costly task. A solution to this problem is to insert electro-optic polymers in a porous optical fiber. Such porous fibers are made of a plurality of interconnected micro-pores in a skeleton of silica glass and can be obtained from phase separation of alkali-borosilicate optical fibers. In this work, we describe porous optical fibers filled with a DR1-polyacrylate electro-optic polymer.
Photochemical characterization and holographic recording of fulgide Aberchrome 670 and 540-doped polymethyl methacrylate (PMMA) were investigated. Upon UV and visible exposure, closed-form absorbency followed first-order kinetic. The real time holographic recording in fulgides doped PMMA films were studied. The effect of dye concentration, thickness of the film and the recording intensity on diffraction efficiency was reported. We used the Langmuir-Blodgett (LB) technique in order to transferring a compact multilayer of fulgide spread on water surface between two thin films of cellulose acetate (CA). The preliminary results of the surface pressure-area isotherms obtained by LB show the transfer of the fulgide between two CA thin films. Finally, the photochromic reaction of fulgide in LB films was investigated.
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