关于衍射的几个问题

Several Questions Related to Diffraction

文献［１～５］中，有许多观点是有问题的，我们认为，边界衍射波理论在球面波人射情况下是正确的，边界衍射波没有π相移，几何波不能独立于边界波改变相位；重新解释了高斯光束经小孔后中心光强增大的实验，圆屏后阴影区内的光强不是零阶Ｂｅｓｓｅｌ函数分布；在第一暗环处截取Ａｉｒｙ光束得到的光束并非无衍射，而只是无衍射条纹。

In several newly published papers[1～5], there are lots of point of views, which are doubtable. We show that the boundary diffraction wave theory is correct under spheric wave incidence, the boundary diffraction wave does not experience π phase shift, and the phase of geometric wave can not be changed independent of boundary wave; we reexplain the experiment that when Gaussian beam passes a small hole, the central intensity may become higher than that of the unchanged Gaussian beam; In the shadow after a round obstacle, the intensity does not obey J￣2(0) Bessel distribution; If the Airy beam is truncated at the first dark ring, the truncated beam does have not diffraction ringes, but can not be said 'non-diffraction'.