On z-coherence of beams radiated by Schell-mode sources with Gaussian profile

The degree of coherence and the intensity distribution on the axis of the beam radiated by a planar partially coherent source of the Schell-model type are investigated. We present an expression for the on-axis cross-spectral density which is valid for a very general Schell-model source, with the only constraint that the intensity distribution across the source is Gaussian. Furthermore, we show that such an expression takes very simple analytical forms for several commonly used degrees of coherence of the source. (C) 2022 Optica Publishing Group

Automated summary

The coherence and intensity distribution of a beam radiated by a planar partially coherent source of the Schell-model type were investigated. An expression for the on-axis cross-spectral density, valid for a wide range of Schell-model sources with Gaussian intensity distribution, was presented. The study provides important insights into the radiation characteristics of the beam.