title: Purity of partial polarization in the frequency and time domains.
abstract: We discuss the properties of fields whose polarization states remain invariant in diffractive devices; in particular, in Young's interferometer. We investigate the conditions for such fields, called pure partially polarized fields, in both the space-time and space-frequency domains and show that the frequency-domain condition is a more general one. We also discuss the relationships of polarization purity and nonquantum entanglement between polarization and spatial (or temporal) correlation.
authors.affiliation: Department of Physics and Mathematics, University of Eastern Finland, P.O. Box 111, Joensuu FI-80101, Finland. timo.hassinen@uef.fi
authors.forename: Timo
authors.initials: T
authors.lastname: Hassinen
authors.forename: Jani
authors.initials: J
authors.lastname: Tervo
authors.forename: Ari T
authors.initials: AT
authors.lastname: Friberg