The choice of the mathematical form of spatial correlation functions for optical fields is restricted by the constraint of nonnegative definiteness. We discuss a sufficient condition for ensuring the satisfaction of such a constraint.
© 2007 Optical Society of America
Original Manuscript: September 19, 2007
Revised Manuscript: November 19, 2007
Manuscript Accepted: November 19, 2007
Published: December 10, 2007
F. Gori and M. Santarsiero, "Devising genuine spatial correlation functions," Opt. Lett. 32, 3531-3533 (2007)