Further studying half space configurations of four beams (HCFBs), or also so-called pan-umbrella configurations and proving that any Bravais lattice can be formed by HCFBs.

• 进一步考察了半空间的四光束配置,或者可以称之为泛伞形配置,证明任意一种Bravais格子都能由半空间光束配置干涉生成。