In general, an extremely high diffraction efficiency is obtained by a phase hologram. However, the bleached photographic phase hologram obtained from an amplitude hologram necessitates stabilisation from fading and reduction of noise in the reconstructed image.
In this paper, changes in the fade resistance stability and diffraction efficiency of holograms bleached by various processes are described.
The most stable bleaching method is found to be that using iodide.
The cause of noise in images reconstructed by the bleached photographic phase holograms are shown to be due mostly to the intermodulation term within the holograms. The negative feedback method is suggested to be the most suitable for reducing this noise.
When the above-mentioned iodide bleached hologram is treated by this method, extremely effective results in improving the quality of the reconstructed image are obtained.
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