Water-resisting red-sensitive photopolymer with simple reprocessing has high sensitivity, high diffraction efficiency (>80%) and large refractive index modulation. Sensitivity and resolution is increased by using compound spectral sensitization compound coinitiator and compound monomers. The polymerization of the monomer can be controlled, and so the holograms preserved in the natural environment for a long time do not disappear. The photopolymer holographic recording materials without hidden reaction have good physical and chemical stability. The result of research indicates that the holographic recording plates have better real-time character. The photochemical polymerization mechanism and the effects of the components on the photopolymerization rate are investigated, and other characteristics about this material are also analyzed. In addition, the photopolymer is harmless and pollution-free, and so the photopolymer has large practical value and prospects of wide applications.
In this paper, a blue-sensitive photopolymer holographic recording material was prepared. The visible-light sensitive photoinitiating system was composed of sensitizer, initiator, hydrogen-donor, monomer and binder. Compound sensitizing as a new method for improving exposure sensitivity of this material was proposed. Experiments results indicate that compound sensitizing significantly increased the exposure sensitivity from about 55mJ/cm2 to 40 mJ/cm2, while without any affection to the maximum obtainable diffraction efficiency. More than 85% of transmission grating diffraction efficiency can be attained as a very simple post process was performed. Mechanisms of polymerization and hologram formation were discussed. The holograms, with a good physical and chemical stability under ambient circumstance, have much potential in optical communication, such as filters and switches.