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Exploiting correlation properties of speckles behind diffusers have shown to be a promising method for non-invasive and high-speed biomedical imaging. We propose a theoretical and numerical model based on a stack of thin diffusers to study speckle correlations inside forward scattering media such as biological tissue. Optical vortices in such media have the specificity to be created in pairs to satisfy topological-charge conservation. Statistics of optical vortices generation and propagation through and inside forward scattering media will be discussed.
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