We consider electromagnetic spectral spatial coherence of random stationary light beams of arbitrary spectral width. We demonstrate that the normalized spectral coherence (or two-point) Stokes parameters and the electromagnetic spectral degree of coherence can be measured by narrowband filtering the light and detecting the spectral density and the polarization-state fringes around the optical axis of Young’s interferometer. It is also shown that the normalized spectral polarization (or one-point) and coherence Stokes parameters are unaffected by filtering, and that the filtered light is strictly cross-spectrally pure. We further prove theoretically and confirm experimentally that the (time-domain) electromagnetic degree of spatial coherence of the filtered light at the pinholes does not increase when the passband of the filter is reduced.
© 2018 Optical Society of AmericaFull Article | PDF Article
20 July 2018: A correction was made to the funding section.
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