in spectrochemistry
Also contains definition of: non-coherent source in spectrochemistry
https://doi.org/10.1351/goldbook.C01132
Those sources where the
radiation
has a constant phase relationship between waves spatially as well as temporally, e.g. lasers. Non-coherent optical sources emit radiation which is randomly distributed in phase, spatially as well as temporally. Most sources which are used in spectroscopy
and for spectrochemical analysis conform to this latter group.