COARSE PINHOLE ARRAY FOR RECORDING IMPROVED REDUNDANT HOLOGRAMS

摘要

The use of a redundancy means including a pinhole array having a ratio of the distance between adjacent pinholes to the maximum linear dimension of a pinhole of at least 30 not only provides high effective redundancy, but the spatial signal-to-noise ratio in the reconstructed image of a recorded hologram recorded with such a pinhole array and played back with coherent wave energy is significantly higher than heretofore obtainable, particularly when less than ideal optic elements are employed in the recording system.