光源宽度与干涉条纹可见度的关系

Relationship between width of light source and visibility of interference streak

在双缝干涉实验中,所用光源若是有一定宽度的,则屏上干涉条纹的可见度将受到一定的影响.当宽到一定程度时,屏上干涉条纹的可见度将下降到不可观测的程度.推导出了屏上不可观测的情况出现时所用光源的最大允许宽度.

The visibility of the interference streak on a distant screen will be affected when the light source there has a certain width in a double-slit interference experiment. The visibility of the interference streak on the screen will decline to invisible level. The paper derives the quantitative relation to maximum admitted width of the light source used when unobservable circumstance on the screen appears.