Abstract
We extend the concept of cross-spectral purity from the spectral density to the polarization properties of electromagnetic fields by considering the polarization Stokes parameters. We show that purity conditions similar to those in the case of electromagnetic cross-spectral purity can be derived for all the Stokes parameters. Furthermore, we introduce a situation of strict cross-spectral purity which leads to the equality of the degrees of coherence for electromagnetic fields in the space–time and space–frequency domains.
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Hassinen, T., Tervo, J. & Friberg, A.T. Cross-spectral purity of the Stokes parameters. Appl. Phys. B 105, 305–308 (2011). https://doi.org/10.1007/s00340-011-4668-z
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DOI: https://doi.org/10.1007/s00340-011-4668-z