The reflective light filed distribution is studied in great detail with diffraction approach , which is based on the quasi - gaussian beam model of the light emitted from the multimode transmitting fiber and conclusions drawn by beckmann on the scattering light from random rough reflector 引入了beckmann关于随机粗糙表面光散射理论的相关研究结论,基于衍射分析法建立了准高斯光经过反射面后的反射光分布模型。