Theoretical analysis and experimental verification on speckle fields produced by the square loop aperture and circular ring aperture and their phase singularities
方形环孔和圆环孔形成的散斑场及相位奇异特性的理论分析和实验验证

The speckle fields and their phase singularities produced respectively by the square loop aperture and circular ring aperture are studied. It is found that the zero-contour of the real and imaginary parts occurs in the complicated tangential and intersectional situations. The tangential and intersectional points can also form phase singularities,around which the phase distribution shows the characteristics of symmetry and discontinuity,which differs from the spiral distribution around the traditional singul...