focal radius

基本解释

The second-order moment radius of the focal spot depending on intensity distribution and phase distribution of near field is derived, and its clear physical meaning is described.
结果表明：畸变光束的焦斑二阶矩角半径由光束近场波前相位梯度的强度加权均方根值和对数强度梯度的强度加权均方根值决定。
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The results of computer simulation show that both the radius of disk and the depth of focal length decrease as increasing incidence wavelength, meanwhile, the intensity of disk is enhanced.
数值计算了圆形透镜的色散，结果表明：焦斑的半径和焦深随入射波长的变大而减小，光斑的强度随入射波长的变大而增强。
The radius and position of waist spot of CO2 laser beam focused by a single Ge lens were measured experimentally, and the focal length of the Ge lens was determined. The result is in agreement w…
实验测量了经单一锗透镜聚焦后的CO_2激光束的腰斑半径和位置，同时确定了聚焦锗透镜的焦距，其结果与实际情况一致。