Interference of Speckle Fields in the Diffraction Zone of a Focused Spatially Modulated Laser Beam by a Random Phase Screen

摘要

The processes of formation of average-intensity interference fringes upon diffraction by a randomphase object of a laser beam having interference fringes and focused on the surface of the object are considered. The dependences of the fringe contrast on the parameters of scattering inhomogeneities of the object and the parameters of the focused laser beam are established in analytical form for various diffraction regimes. Practical possibilities of a method of probing of scattering objects in problems of measuring the parameters of inhomogeneities and problems of interference-pattern formation in optical systems with scattering media are discussed.