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）。
The laser beam passing through the focusing systems gets an facula, which consists of main spot and sidelobe on the focus plane.
当激光束投射在浮雕光栅上，透过光栅的衍射光斑就反映了浮雕光栅的表面信息。
When the laser beams project in the relief gratings, its transmission diffraction patterns represent the surface informations of the relief gratings.
使用不可见激光束垂直投射到旋转全息圆盘上，产生复数衍射光束向不同方向传播。
The compound diffraction beam will be propagated toward different directions when the invisible laser beam is vertically projected on the rotary holographic disk.
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