Abstract
Up to now the degree of coherence of a wave field was only defined on the basis of a scalar wave theory. In the present paper a generalization is proposed applicable to any quasi-monochromatic stationary electromagnetic field. This « electromagnetic degree of coherence », which is a single scalar quantity, is introduced from the analysis of an interference experiment and it is shown to be related to the trace of the correlation tensor of the electric field introduced byE. Wolf in 1954.
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