Devising genuine spatial correlation functions.

  title={Devising genuine spatial correlation functions.},
  author={Franco Gori and Massimo Santarsiero},
  journal={Optics letters},
  volume={32 24},
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. 
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