I have come across this word in context of wave optics, but I am not really sure if I understand it. The descriptions I read connected it to the ability to interfere- in terms of correlations. Is non-monochromaticity synonymous with 'lack of coherence'? If so, is a pulsed laser with a finite frequency spread also 'incoherent'?

202194 — S is called the density matrix or coherency matrix associated with a polarized beam (a pure state in quantum mechanics). As we have seen already ...

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A Michelson interferometer with a Xenon lamp source is modeled with the spectral property, i.e. limited coherence length, of the source fully considered.

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