It was shown recently that the basic properties of a fluctuating electromagnetic beam can be derived from knowledge of a 2×2 cross-spectral density matrix of the electric field in the source plane. However, not every such matrix represents a source that will generate a beamlike field. We derive conditions that the matrix must satisfy for the source to generate an electromagnetic Gaussian Schell-model beam.
Korotkova, Olga; Salem, Mohamed; and Wolf, Emil, "Beam Conditions for Radiation Generated by an Electromagnetic Gaussian Schell-Model Source" (2004). Physics Articles and Papers. 23.