  We present PyWolf, an open-source software capable of performing numerical
simulations of partially coherent light propagation from two-dimensional light
sources. PyWolf computes the evolution of a user-defined cross-spectral density
function in the Fresnel and far field approximations, which enables the
retrieval of second-order optical quantities of interest such as the spectral
degree of coherence and spectral density for a given frequency. The open-source
tool kit PyOpenCL is used to increase the computation speed. We present
examples of propagation of different source models and optical systems to
validate our implementation. Performance results for the computation speed when
using parallel computation through PyOpenCL is shown. Source models and
propagation systems can be easily added to PyWolf, which has a graphical user
interface built with PyQt5. This software can be of great utility for partially
coherent light simulation problems that are difficult to treat analytically.

Optics;Computational Physics