A wave propagating in a random medium undergoes multiple scattering and forms a complicated intensity pattern, commonly referred to as a speckle pattern. It is described in statistical terms, with the help of probability distributions and correlation functions. The intensity correlation function, 〈δI(r)δI(r′)〉, where δI(r) is the deviation from the averaged intensity at point r, contains a short range term C1(r, r′), which oscillates on a scale of the wave length and exponentially decays beyond the mean free path [1].

© 2004 Optical Society of America

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