meshgrid函数用于根据给定的横纵坐标点生成坐标网格，以便计算二元函数的取值。
设二维高斯函数表达式为：
程序如下：
u=[-10:0.1:10];
v=[-10:0.1:10];
[U,V]=meshgrid(u,v);
H=exp(-(U.^2+V.^2)./2/3^2);
mesh(u,v,H); %绘制三维曲面的函数
title('高斯函数曲面');
运行结果为：
Transforming Gaussian Beams into Uniform, Rectangular Intensity Distributions
Sunday, January 01 2012
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The majority of laser types in current use produce output beams with circular or elliptical crosssections, with either Gaussian or near- Gaussian intensity profiles. This Gaussian intensity distribution is acceptable, and often beneficial for many applications in which the laser beam is being focused to a small spot. However, there are also many different uses for which a uniform intensity distribution (often referred to as a “flattop”) would be more optimal. For example, in materials processing tasks, a uniform i