Détermination de la surface de cohérence à partir d'une expérience de photocomptage

摘要: The theoretical distribution, with exact second moment, of the number photoelectrons emitted by an extended photodetector illuminated partially coherent light is first derived. Then parameter N, degrees freedom, obtained from moment for (T detection time and Tc coherence time). N then plotted as a function surface detector expressed in three different ways both circular source square detector. In cases considered to be uniform brightness. An elementary called determined extrapolating towards small values asymptotical behavior large surface. For sources, this equal . λ0 mean wavelength, D distance between detector, Ss source.