Increase the size of Bi12SiO20 real-time hologram for three-dimensional display
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A large-screen, real-time hologram device using Bi12SiO20 (BSO), which enables observation of reconstructed images by parallax vision has been fabricated. The BSO wafer size of the device was 70x70x3 mm3. The wafer was dipped in silicon oil to avoid the electric discharge between the electrodes. The conditions were studied to obtain complete reconstruction from the large Fresnel volume-type real-time hologram and a uniform diffraction efficiency was obtained over the entire area including the core of the crystal. Irradiation at a level of 4 mJ/cm2 yielded a diffraction efficiency of 0.5%. Binary and half-tone images were holographically recorded and reconstructed. The reconstructed images could be observed by the naked eye, including the actual depths.
Key wordshologram photorefractive three-dimensional display Bi12SiO20 diffraction
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