Measurements of the four-point coherence function by the use of the coherence enhancement phenomenon.

We present laboratory results for measurements of the four-point coherence function of a spherical wave in the region of coherence enhancement after backscattering through turbulence. Experimental results are compared with the theoretical predictions. We conclude that the shape of the four-point coherence function in our experiment depends on the value of the inner scale of turbulence.

Use of polarization in interferometry after double passage through turbulence.

We report what are to our knowledge the first experimental results of coherence enhancement that use polarization to separate coherent and incoherent paths.