Dynamic characteristics using dark reaction in photopolymer

摘要

The diffraction efficiencies of DuPont's photopolymer OmniDex$+R$/ 706 holographic recording material are measured for exposures, incident angles, diffusion-time delays and exposure times. As attaching the material on a glass or plastic plate, unwanted secondary gratings are induced, which make the diffraction efficiencies much lower than expected. In order to eliminate this phenomenon, we change the incident angle between the object beam and the reference beam. Since the polymerization and the photospeed of photopolymers are 1000 times slower than silver halide materials, holograms can be influenced with many kinds of parameter. It was examined the static characteristics and the dynamic characteristics that are related with an exposure time and a diffusion-time delay using the dark reaction of monomer in polymerization. Applying the dynamic characteristics, the diffraction efficiencies of this material were stabilized. As a result, the best condition is achieved when the total input power is 8 mW $LB@exposure energy is 200 (mJ/cm$+2$/) in our experiment$RB and the diffusion-time delay is from one to three minute.