MODELING THE TRANSITION OF THE SPATIAL COHERENCE AND THE INTENSITY DISTRIBUTIONS FROM THE NEAR TO FAR ZONE FOR AN ANISOTROPIC AND ASTIGMATIC GAUSSIAN SCHELL-MODEL SOURCE

A simple model will be used to generate a simultaneous anisotropic and astigmatic gaussian Schell-model source and to analyse the behaviour of the spatial coherence and intensity distributions on the propagatio n from the near (included the source plane) to far zone. Some special cases are reported where the ellipse of the spatial coherence rotates by 180 degrees from the source plane to the far zone. The conditions, that allow to distinguish between this situation and no rotation, will be established. Other cases, where the behaviour of the coherence and intensity in the near zone can be carried out with the information fr om the far zone and the source plane, will be reported.