有限孔径Bessel-Gauss场的又一简单解析描述

Another approximately analytical description for the BesselGaussianbeam fields of a finite aperture

给出了有限孔径Ｂｅｓｓｅｌ、ＢｅｓｅｌＧａｕｓｓ和Ｇａｕｓ波束的一种简单的解析描述．根据阶跃函数在区间〔０，＋∞）可以近似为一组高斯函数的线性叠加这一性质。

It is presented an approximately analytical description for the Bessel,BesselGaussian and Gaussian beams with a finite aperture.Based on the fact that the step function can be decomposed as a linear superposition of a series of Gaussian functions,these three beams are in general expressed as a combination of a set of infinite aperture BesselGaussian beams.This approach greatly simplifies the calculation of the diffracted field distribution.