The first-order statistics of partially developed non-Gaussian speckle patterns

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Abstract
The probability density function of the partially developed non-Gaussian speckle intensity is experimentally investigated and distinctive differences are confirmed to exist between the probability density functions of partially developed Gaussian and non-Gaussian speckle intensities. To characterise these differences, a new skewness parameter is introduced which describes the asymmetry of the probability density distribution of speckles, and some theoretical considerations are also presented. Finally it is shown that the skewness parameter expresses both the average contrast and the dependence of speckle statistics on both the random phase fluctuation of diffusers and the effective number of scatters contributing to the observation point.