Whereas the classic Stokes parameters are measures of intensity, the recently introduced two-point Stokes parameters characterize spatial coherence. It is shown that in analogy to the Stokes parameters, the two-point parameters have a physical interpretation as sums and differences of (scalar) cross-spectral density functions of specific electric-field components. A measurement scheme and several physical consequences of the two-point parameters are discussed.
© 2009 Optical Society of America
Original Manuscript: June 10, 2009
Revised Manuscript: August 11, 2009
Manuscript Accepted: August 14, 2009
Published: October 5, 2009
Jani Tervo, Tero Setälä, Antoine Roueff, Philippe Réfrégier, and Ari T. Friberg, "Two-point Stokes parameters: interpretation and properties," Opt. Lett. 34, 3074-3076 (2009)