Vol. 10, Issue 4, pp. 381-398

Abstract

The influence of primary astigmatism has been investigated on the intensity distributions in the Fraunhofer diffraction patterns formed by an optical system with a circular aperture under partially coherent illumination when the mutual coherence function contains a spatially non-stationary quadratic phase term. Results are presented to illustrate the degrading effects of various amounts of astigmatism on the image quality for several values of the coherence interval and the phase parameter. Besinc form of correlation has been assumed for the mutual coherence function. The extent of improvement in the intensity distribution has been illustrated for non-uniformly illuminated aperture in case of typical apodizing functions.