spot diameter meaning in English

斑点直径
光斑直径
光点直径

Spot diameters of just a few thousands of an inch can readily be attained with convenient short focal length lenses .
用普通的短焦距透镜不难得到直径只有几十微米的光点。
Beam spot diameter
束斑直径
In order to obtain the laser beam with better beam quality , less spot diameter and higher power density in laser manufacturing ( lm ) , gaussian beam used in lm was transmitted and transformed
摘要为了获得光束质量较好、光斑尺寸较小、功率密度较高的、适合激光加工的激光束，对激光加工中的高斯光束进行传输与变换。