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Global non-invariance of the spectrum of light on propagation

During the last few years it has been conclusively demonstrated, both theoretically and experimentally, that the coherence properties of a source affect the spectrum of the emitted radiation.1 Expressed differently it was shown that the spectrum of the field depends not only on the spectrum of the source, but also on the state of coherence of the source. This result holds both for fields generated by primary sources, and for those generated by secondary ones, such as, for example, illuminated apertures or scattering media.