Abstract

The total light flux diffracted by a developed holographic plate is proportional to the variance of the spatial distribution of amplitude transmittance of the plate. This light forms the real and virtual holographic images and also the flare surrounding the reference beam. The variance of amplitude transmittance does not, in general, depend upon the size or form of the object, but only upon the total amount of light received from it, as this affects the beam-balance ratio. The sensitometric characteristics of the plate are taken into account by making use of three plots, namely, amplitude transmittance vs exposure, amplitude transmittance vs log exposure, and density vs log exposure. First-order expressions are derived for the ratio of the light flux diffracted by the hologram to that received from the object in terms of measurable parameters such as beam-balance ratio, average exposure, and gradient of the sensitometric curve. In like manner, we can calculate the ratio of the radiance of the holographic image to that of the original object.

© 1968 Optical Society of America

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Equations (65)

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