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光源的时间相干性，可以从光源发光的微观过程来说明。可以从不同的方面来描述。用最大光程差和谱线宽度来表示，也可用相干长度和相干时间来表示。１实验原理ａ．用迈克尔逊干涉仪测量光源的最大光程差时，通常是根据干涉条纹清晰可见的程度来判断的。干涉条纹的可见度定义为
The temporal coherence of the light source can be illustrated by the microscopic process of light emission from the light source. Can be described from different aspects. Expressed by the maximum optical path difference and spectral line width, it can also be expressed by the coherence length and the coherence time. 1 experimental principle a. When using the Michelson interferometer to measure the maximum optical path difference of a light source, it is usually judged based on the degree to which the interference fringes are clearly visible. The visibility of interference fringes is defined as