passing beam 近光光束 ; 近光
It is far from simply a radio beam passing through a vacuum at "the speed of light".
这远不像一束无线电波“以光速”穿过真空层那样简单。
The focusing characteristics of Gaussian beam passing through the maladjusted telescope optic system are studied.
研究了高斯激光经过失调望远镜系统聚焦的特点。
The laser beam passing through the focusing systems gets an facula, which consists of main spot and sidelobe on the focus plane.
由于光的衍射作用，使通过聚焦系统的激光束入射到特定靶面成一光斑（主光斑） ，而在主光斑以外还有次级光斑圈（旁瓣）。
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