EXPERIMENTAL INVESTIGATION OF THE SPECKLE POLARIZATION FOR A POLISHEDALUMINUM SAMPLE

As speckles carry information about polarization, we have perfected a polarimeter using the Stokes-Mueller formalism from which we exploit t he matrix to analyse speckle polarization. The noise effects on the Mu eller matrix are minimized to separate experimental noise from the dep olarization phenomenon. In order to simplify this depolarization pheno menon, we used a polished aluminium sample. We describe a statistical polarization analysis of the speckle grains which show the depolarizat ion evolution of the speckle field. A global polarization analysis of the clipped speckle is then performed. The experimental results show t hat it remains polarized, independently of the observation direction, and only shows a slight polarization dispersion.