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这种实验可以利用一套便携实验箱进行。我们区的中学都拥有这种实验箱。实验项目由值班的教师每月更换一次。激光李萨如图像激光是一种波束很窄的、几乎为单色的光。这种光束可以在数米以外仍然保持平行。用一面旋转着的凹镜将激光反射到屏幕上,将会产生一种椭圆形图像。如果将这椭圆形图像经第二面凹镜再次反射,则屏幕上又会出现什么样的情形呢?我们要观察的就是两面凹镜所产生的众多椭圆图像相互作用所产生的结果。在两面凹镜的旋转速度完全一致时,屏幕上的各椭圆图像将保持不动;如果一面凹镜的旋转速度比另一面快些,整个图象像似乎在旋转;假若两面凹镜旋转速度互
This experiment can be carried out using a portable test box. Our district secondary schools have this kind of experiment box. The experimental project is replaced monthly by teachers on duty. Laser Lissajous Image Laser is a very narrow-beam, almost monochromatic light. This beam can be parallel to a few meters away. Using a rotating concave mirror that reflects the laser light onto the screen, it produces an oval image. What happens again on the screen if the oval image is reflected again by the second concave mirror? What we are looking at is the result of the interaction of numerous elliptical images created by the concave mirrors. When the rotational speed of the concave mirror on both sides is exactly the same, the elliptical images on the screen will remain intact; if the rotational speed of the concave mirror is faster than the other one, the whole image seems to be rotating; if the rotation speed of concave mirrors