Abstract
The interrogation of a holo-specklegram from point to point results in two side lobes as well as the formation of central Young's fringes. It is proved theoretically and experimentally that these fringes in the side lobes are, in essence, the Young's interference fringes of the first-order diffractions of the pair of identical speckles in the holo-specklegram. A practical quantitative formula is presented to calculate the in-plane displacement.
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