用有限差分模拟高斯脉冲在自由空间传播，运行该脚本，你会得到一个表面，它是由脉冲在1微米的步骤传播。

-Using the finite difference simulation of Gaussian pulse propagation in free space, run the scr ipt, you will get a surface, it is spread by the pulse in steps of 1 micron.