探究光的衍射实验反向衍射条纹的成因

Exploration on the Cause of Reverse Diffraction Fringes in Light Diffraction Experiment

在光的衍射实验过程中,平行光束经过衍射光栅后,不但在与入射光同方向的观察屏上看到衍射图样,当在与入射光相反方向放一个观察屏时,也能看到类似的衍射现象.通过实验发现,反方向的衍射图像与光栅基片的反射光干涉有关.从实验和理论两方面对这一现象进行了分析论证.

In the process of light diffraction experiment, when parallel beam through the diffraction gratings, not only could we see the diffraction pattern on the viewing screen which is in the same direction with incident light, but also we could see a similar phenomenon of diffraction when we put a viewing screen in the direction opposite to the incident light. Through the experiment,we found that the opposite direction diffraction pattern has relation to the reflected light interference of the grating substrate. In this paper, we analyze and prove the phenomenon from two aspects of experiment and theory.