Diffusive photopolymer is one of the fastest developed fields on the application of the holographic optical storage, and has the advantages of huge data capacity and low coat. Based on the extended model of the nonlocal polymerization-driven diffusion, the photophysical mechanism of the dual monomer system in the photopolymer holographic material is introduced. The diffusion coefficient, polymerization rate and diffusion rate are determined experimentally to provide the conditional parameters in the model. Quantitative analysis of photopolymer formulation, refractive index modulation and diffraction efficiency. This analysis can improve material performance and provide a basis for the development of next-generation holographic storage materials. A nonlocal diffusion model is used to predict theoretically the grating evolution. The model has been developed to account for both nonlocal spatial and temporal effects in the medium, which can be attributed to polymer chain growth and corresponding polymeric kinetics equations are given. We find the relationship between these equations and refractive index modulation, and obtain a diffraction efficiency equation which is appropriate for transmission volume grating. The proportion of dual monomer in chemical reaction system was optimized, and the high optical transparency of photopolymer film were obtained.
In order to study the new holographic recording medium, four kinds of photopolymer materials containing TMPTA monomers are studied. The three-dimensional interference fringe information was successfully recorded in the photopolymer film samples, which proved that it has good holographic recording and high resolution ability. The experimental results show that when the recording angle is 30°, the diffraction efficiency is as high as 93.5%@532nm and the refractive index modulation is as high as 3.07×10-3. As a holographic recording medium, it has high resolution ability and high diffraction efficiency, the material is possible suitable for permanent storage of holograms and big data, besides it has strong advantages and potential applications in the large-scale 3D display, big data storage, holographic anticounterfeiting, holographic printing and other fields.
In order to study a new holographic recording medium, this paper prepares a kind of holographic photoinduced polymer material based on a double monomer and a composite photoinitiator. Add different photoinitiator, such as red bengal (RB), titanium (irgacure 784, Ti) and a mixture of the two in the photopolymer materials, and then perform holographic exposure. We found that the compound photoinitiator improved the diffraction efficiency, light sensitivity, and transmittance to some extent compared with a single photoinitiator. Combined with the diffusion kinetics, we studied the effects of the two kinds of photoinitiators on the photoinduced polymers, and the ratio of the composite photoinitiators was optimized. The holographic parameters such as diffraction efficiency under different exposure intensities, different exposure time, different thickness and different wavelength are tested, it is shown that the exposure conditions have a great influence on the diffraction efficiency. At the same time, this material is sensitive to both green light and red light. The experiment results show that the reconstructed image is clear and bright, which indicates that the photoinduced polymer is suitable for dual-wavelength multiplexing holographic storage.
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