prefocused beam

例句：

1. 1.The laser is designed to prefocused beams of light.
   激光设计用来聚焦光束。
2. 2. In the experiment, the prefocused beam was used to scan the surface.
   在实验中，使用预聚焦光束扫描表面。
3. 3. The researchers developed a new technique to prefocused beams of light more efficiently.
   研究人员开发了一种新技术，更有效地聚焦光束。