光的干涉现象和光的衍射现象,是证明光具有波动性的主要依据,也是讲授物理光学时的实验基础。由于自然界存在着大量的非相干光源,光源的发光部分都是独立发光,它们的频率、相位和振动方向各不相同,所以光的干涉、衍射实验,在中学物理教学中较难做好,即使在设备齐全的条件下,也要在晚上或暗室中进行,而且每次只能供少数学生观看。现在应用氦、氖激光管受激工作时发出频率、相位 The phenomenon of light interference and the phenomenon of light diffraction are the main evidences to prove that light has the property of volatility. It is also the experimental basis for teaching physical optics. Due to the existence of a large number of non-coherent light sources in nature, the light-emitting parts of the light sources emit light independently, and their frequency, phase and vibration direction are different, so light interference and diffraction experiments are more difficult to do in physics teaching in middle schools. In well-equipped conditions, it is also done in the evening or in the dark, and only for a small number of students at a time. Now use helium, neon laser tube excited when the work frequency, phase