The sample should not be so large as to increase unduly the width of the diffractedbeam.
样品不应当过分大,以致不恰当地增加了衍射束的宽度。
2
It is pointed out that the non-diffractedbeam is a kind of Fresnel diffraction phenomenon.
同时指出所谓无衍射光束实际上是一种菲涅耳衍射现象。
3
When a volume holographic grating is readout under off-Bragg condition, determining the direction of the diffractedbeam is an important issue in the coupled-wave theory of volume gratings.