A two-step holographic process for the fabrication of an imageplane disk-type multiplex hologram is described in this paper. The diffraction efficiency of the transfer hologram is measured as a function of exposure. It is found to be influenced by the polarization of the light beams of the copying system, resulting in different diffraction efficiencies from different areas (under different interference conditions) of the hologram transfer. The factors which cause the phenomenon of diffraction-efficiency difference are demonstrated and the corresponding experimental results are discussed.
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