办事指南

Curved laser beams could help tame thunderclouds

点击量:   时间:2019-03-08 05:10:01

HOW do you “curve” a laser beam without using mirrors? The intensity of a laser beam is normally concentrated in a central region, but Pavel Polynkin at the University of Arizona, Tuscon, and colleagues have built a device that splits a straight laser pulse into certain constituent parts. They used this to create a beam with an intense region on its right-hand side and less intense regions on the left. As such a pulse travels,