fo-cal shift

• 焦移

fo-cal shift的用法和样例：

例句

1. The encircled-power method is introduced to define the beam width and real focal plane of focused sinh-Gaussian beams, thus their focal shift can be determined.
   使用环围功率法定义束宽和实际焦面，由此可以决定聚焦双曲正弦高斯光束的焦移。