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.
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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