INCREASE THE SIZE OF BI12SIO20 REAL-TIME HOLOGRAM FOR 3-DIMENSIONAL DISPLAY

A large-screen, real-time hologram device using Bi12SiO20 (BSO), which enables observation of reconstructed images by parallax vision has be en fabricated. The BSO wafer size of the device was 70x70x3 mm(3). The wafer was dipped in silicon oil to avoid the electric discharge betwe en the electrodes. The conditions were studied to obtain complete reco nstruction from the large Fresnel volume-type real-time hologram and a uniform diffraction efficiency was obtained over the entire area incl uding the core of the crystal. Irradiation at a level of 4 mJ/cm(2) yi elded a diffraction efficiency of 0.5%. Binary and half-tone images we re holographically recorded and reconstructed. The reconstructed image s could be observed by the naked eye, including the actual depths.