The sample should not be so large as to increase unduly the width of the diffracted beam.
样品不应当过分大，以致不恰当地增加了衍射束的宽度。
When a volume holographic grating is readout under off-Bragg condition, determining the direction of the diffracted beam is an important issue in the coupled-wave theory of volume gratings.
体全息光栅的读出偏离布拉格条件时，衍射光方向的确定是体光栅耦合波理论中的一个重要问题。
Amazingly enough, a beam of electrons had thus been diffracted in a manner completely analogous to a light wave bouncing off a reflection grating.
一束电子波衍射的方式，同光波从一个反射光栅上弹回的方式完全类似，这真是不可思议。
It is pointed out that the non-diffracted beam 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。
It is pointed out that the non-diffracted beam 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。
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