Comptage des Photoélectrons Provenant de Points Statistiquement Indépendants et d'une Surface Etendue de la Photocathode
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The experimental photocount distribution from a photocathode illuminated by a pseudothermal source is compared with theory. The detection time is much smaller than the coherence time [Formula: see text]. The agreement is excellent for an illuminated area composed of holes small enough to be considered as points and far enough to guarantee incoherence among them. But, for an extended circular area, the agreement is good only in the limits when that area is very small or very large with respect to the coherence area. Finally, we consider on the one hand, the evaluation of an extended detection area as a function of the number of statistically independent points, L, and on the other hand, the relative size of a physical point.