A simple technique employing two correlated diffusers has been used to measure the degree of spatial coherence of light sources. We present a description of the method as well as experimental measurements on quasimonochromatic sources of various sizes. Good agreement between experimental and theoretical results has been demonstrated.
C. P. Grover,
H. M. van Driel,
"Measurement Of Spatial Coherence Using Correlated Diffusers", Proc. SPIE 0192, Interferometry, (25 December 1979); doi: 10.1117/12.957853; https://doi.org/10.1117/12.957853