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众所周知,白光是由多种频率的单色光组成的复色光。因此可以利用棱镜的色散原理获得白光的彩色光谱,也可以利用干涉或衍射装置获得白光的彩色光谱。但是还有一种将白光分光的方法,这就是偏振光干涉。更神奇的是只用一块偏振片及若干张透明薄膜就可以产生彩色的图形。下面就介绍一个由本文作者设计的白光照射下实现反射式偏振光干涉的演示仪。1.偏振光干涉原理
As we all know, white light is composed of a variety of frequencies of monochromatic light complex color light. Therefore, the color spectrum of white light can be obtained by using the principle of dispersion of prisms. The color spectrum of white light can also be obtained by using an interference or diffraction device. But there is another way to split the white light, which is polarized light interference. Even more amazing is that only one piece of polarizer and a number of transparent film can produce color graphics. The following describes a demonstration designed by the author of the white light irradiation to achieve reflective polarization interference. 1. Polarized light interference principle