Flash闪客专家百例随书1到20代码，制作光斑，中国结等20个源码-Flash Flash experts hundred cases of the code with the book 1 to 20, making spot, Chinese knots and other 20 source

激光光斑分析 L1=280;L2=130,镜M1的曲率为140mm,镜M2的曲率为150mm,镜M3为平面镜。固定L1，L2， 计算腔内的光束半径。