This paper primarily discusses recent progress in research dealing with coherence properties of electromagnetic radiation. Using the concept of photon degeneracy and the degree of coherence, problems such as interference, intensity fluctuations and the properties of coherent light sources are explained. Since the radiation process is random, the intensity of the signal generated by the interference of different sources can be determined by the correlation of radiation processes as derived in this paper. Treating photons as bosons, the phenomenon 'intensity interference' is explained as quantum fluctuations. Thus, the coherence properties of radiation may well be interpreted from the basic concept of quantum mechanics. (Author)
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