He points out that a similar spin-filtering of photons due to Braggdiffraction has been seen in cholesteric liquid crystals, which also have a helical structure.
他指出，由于布拉格衍射效应，在同样具有螺旋结构的胆甾相液晶中也观察到了类似的光子自旋滤波。
2
Birefractive index and Braggdiffraction have been oboserved and measured in the crystals.
测量和研究了晶体的双折射率和布喇格衍射。
3
The principle of acoustooptic diffraction was introduced, and the experimental research was carried through about acoustooptic deflexion and modulation of Braggdiffraction.