摘要 : The transformation of the V-dipole by an astigmatic lens is studied analytically and numerically. It is found that after passing through the lens, the V-dipole splits into four C-points which make up two C-dipoles with same singul... 展开 The transformation of the V-dipole by an astigmatic lens is studied analytically and numerically. It is found that after passing through the lens, the V-dipole splits into four C-points which make up two C-dipoles with same singularity index and opposite handedness. By a suitable choice of the astigmatic coefficient, off-axis distance, or propagation distance, the creation and annihilation of more than two C-dipoles may take place, as well as C-points may occur at the focal plane of the astigmatic lens. As a special case, only two C-dipoles annihilate or recreate and no polarization singularities appear at the focal plane in the presence of an ideal lens. 收起