为了获得一种对称压缩圆光束的方法，系统研究了三维自散焦介质中亮暗光束对的共同传输。
To contract the circular beam symmetrically, the co-propagation of the bright and dark beams in three-dimensional self-defocusing media is studied systematically.
给出了光束的聚焦、散焦和陷的条件。
The conditions of focusing, defocusing and trapping of light beam are given.
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