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.
传统激光束中间部分明亮而边缘部分较暗，而螺线管状光束则是一个高能量的明亮螺旋。
Unlike traditional lasers, which are bright in the middle and dimmer at the edges, a solenoid beam contains a bright spiral of intense energy.
通过从来自一个特殊设计的全息图(这里用彩色圆圈来表示)的激光光束的反射，物理学家创造了(用彩色结来表示)暗丝结。
By reflecting a laser beam from a specially designed hologram (shown here as the colored circle), physicists created knots of dark filaments (represented by the colored knot).
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