中文说明：
生成涡旋光有多种方式，空间光调制，涡旋相位板，还有利用叉状光栅衍射法。此程序是叉状光栅生成程序，可以用来产生叉状光栅。
English Description：
There are many ways to generate vortex light, such as spatial light modulation, vortex phase plate, and cross grating diffraction. This program is a cross grating generating program, which can be used to generate cross grating.