PQ/PMMA and PVA/acrylamide photopolymer are fabricated in our Lab. We investigate the holographic characteristics of SiO2, Zinc methacrylate (ZnMA) doped and the methacrylate (MAA) linked PQ/PMMA photopolymer. By optimizing the doping content, the diffraction efficiency, photosensitivity and temperature stability have increased. Moreover, the holographic properties of PVA/acrylamide photopolymer have also been improved. The response time decreases by 55.7% at the optimized SiO2 concentration of 0.4wt%. The photosensitivity increases by 23.1% at the optimal preillumination energy of 72 μJ. Multilayer photopolymers with thicknesses over 500 μm were fabricated, exhibiting better Bragg selectivity.
Experimental studies of holographic thermal stability in phenanthrenequinone (PQ)-doped poly(methyl methacrylate-co-methacrylic acid) [P(MMA-co-MAA)] photopolymers are presented. A possibility to improve the thermal stability of holograms is demonstrated by doping methacrylic acid (MAA) into the poly(methyl methacrylate) (PMMA) polymer matrix. MAA as a copolymerization monomer can form a more stable polymer matrix with methyl methacrylate (MMA) monomer and increase average molecular weight of photoproducts, which finally depress the diffusion of photoproduct. The optimized MAA concentration copolymerized into P(MMA-co-MAA) polymer matrix can bring nearly a month's lifetime of gratings, which is obviously an improvement over the usual PQ-PMMA material under thermal treatment.
The PMMA material doped with high content of PQ is fabricated in our Lab. Dynamic range is studied
to be 2.5mm-1 by peristrophic multiplexing. In Angular multiplexing based on rotating material, 100
frames of gray image are recorded in a 1mm thick sample and the reproduced images have a good
quality. The storage capacity is calculated to be 3.1× 109 bits/cm3, which implies that our PQ/PMMA
material is suitable for volume holographic storage. The intensity of grating increases with time and the
shift of sensitivity angle, which is about 0.1375 deg for each multiplexing image in reproduced process,
are also found. We give a qualitative analysis from the aspect of dark reaction of sample.
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