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A method for increasing the visibility of Young fringes in Laser Speckle Velocimetry of up to 20 is proposed utilizing optical autocorrelation with photorefractive crystal BaTiO3. 1.
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Markus R. Weiss, Azad Siahmakoun, "Enhancement of fringe visibility by squaring with photorefractive processor," Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.22236