multiorder diffractive lenses 基本例句 谐衍射透镜 The high order diffractive lenses take the place of conventional diffractive lenses to improve the performance of the system, and the telescope achieves a broader bandwidth.使用谐衍射透镜代替普通衍射透镜，对系统进一步改进，使望远系统获得了较宽的光谱范围。