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.
結果表明：畸變光束的焦斑二堦矩角半逕由光束近場波前相位梯度的強度加權均方根值和對數強度梯度的強度加權均方根值決定。
www.hplpb.com.cn
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.
數值計算了圓形透鏡的色散，結果表明：焦斑的半逕和焦深隨入射波長的變大而減小，光斑的強度隨入射波長的變大而增強。
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…
實騐測量了經單一鍺透鏡聚焦後的CO_2激光束的腰斑半逕和位置，同時確定了聚焦鍺透鏡的焦距，其結果與實際情況一致。