ZHAO DEXIN. Quality improvement of laser speckle patterns by the method of changing aperture[J]. Acta Optica Sinica, 1983, 3(9): 846
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This paper puts forward a method of taking a laser speckle pattern interferential photograph recorded by two apertures (an annular and biannular aperture). It gives more homogeneous diffraction halo of distribution of light intensity and better Young s fringes image.