title: Sources of arbitrary states of coherence that generate completely coherent fields outside the source.
abstract: A new theorem concerning nonradiating stochastic sources is derived. The theorem is used to describe sources that can have a variety of different states of coherence and yet each of them generating a field that is completely spatially coherent outside the source domain. The bearing of this result on a basic unsolved problem is spectroscopy of partially coherent sources is noted.
authors.forename: G
authors.initials: G
authors.lastname: Gbur
authors.forename: E
authors.initials: E
authors.lastname: Wolf