2008 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 139Article in journal (Refereed) Published
The Poincaré vector, combined with the optical intensity, provides a geometric representation of the polarization state of a beam-like electromagnetic field. For fluctuating beam fields this vector normalized by the instantaneous intensity traces, as a function of time, a path on the Poincaré sphere. We introduce a measure for the average time period over which the Poincaré vector in a stationary beam remains substantially unchanged. This time interval defines the 'polarization time' and from it one deduces the polarization length of the beam. Our analysis is based on an intensity-normalized correlation function associated with the Poincaré vector. For fields obeying Gaussian statistics this correlation function takes on a simple form in terms of previously defined quantities that characterize the polarization and temporal coherence properties of the beam. We discuss beams of blackbody radiation as an illustrative example.
Place, publisher, year, edition, pages
2008. Vol. 139
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-154107DOI: 10.1088/1742-6596/139/1/012011ISI: 000271969600011ScopusID: 2-s2.0-65249101733OAI: oai:DiVA.org:kth-154107DiVA: diva2:758168
QC 201410242014-10-242014-10-142015-10-06Bibliographically approved