光束扩展 meaning in English

beam spread

Study on the spreading of partially coherent beams in turbulent atmosphere by using incoherent superposition method
用非相干叠加法研究部分相干光在湍流大气中的光束扩展
In this paper the dithering of beam light , the undulating of beam intension , spread of the beam light and the dithering of image are introduced
摘要文中介绍了激光信号通过随机大气信道时，大气湍流效应造成了光束抖动、强度起伏，光束扩展和像点抖动等现象。