Abstract

If photographic emulsions are exposed to pseudothermal radiation and laser radiation for periods of time less than or equal to the coherence time of the radiation, the mean number of grains developed due to the interaction with four or more photons will differ. This difference of density is attributed to the fundamental difference of the photon statistics of thermal light and laser light. A density versus log exposure curve is calculated and the gamma for exposure to thermal light is found to be lower than that due to laser light. An experimental method of determining this difference is described.

© 1968 Optical Society of America

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Equations (19)

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