在通常使用迈克耳逊干涉仪的时候,由于一般所用光束的会聚程度不大,同时干涉仪本身的各部件的线度也很小,因而干涉场所包容的范围是很狹窄的。在这种情况下,如在一般的学校里所作的那样,只能由个別的学生逐一的去观察这一现象,见图1。我們能不能在較多的学生面前表演这一干涉現象呢?事实說明是可以的。如果我們设法让光束以較大的会聚程度投射到干涉仪上,并且使用較强的光源,那么当光束由干涉仪的两个鏡 When the Michelson interferometer is usually used, the range of the interference field is very narrow due to the small degree of convergence of the commonly used light beams and the small linearity of each part of the interferometer. In this case, as is done in ordinary schools, this phenomenon can only be observed individually by individual students, as shown in Figure 1. Can we show this interference in front of more students? Facts show that it is possible. If we try to project the beam onto the interferometer with a greater degree of convergence and use a stronger light source, then when the beam is reflected by two mirrors of the interferometer