depth of focusing

• 焦深

depth of focusing的用法和样例：

例句

1. Focal depth of hyperbolic-cosine-Gaussian beams induced by a phase plate was investigated.
   摘要研究了同轴分区相位板对双曲余弦高斯光束焦点区域光强分布和焦深的影响。
2. There are two critical values for outer radius of the inner annular zone, at which focal spot changes sharply.The tunable range of the focal depth is very considerably.
   增大内圆环的外半径，焦深沿轴向变大，相位板可以调节光学焦深，并且可调的范围很大。