We implement experimentally a method for characterizing the two-point coherence properties of fields in two dimensions from measurements of their irradiance at different propagation distances.This method is a form of phase space tomography, based on a definition of the ambiguity function that is appropriate beyond the paraxial regime.In the experiment, a combination of two cylindrical lenses is used to create focused fields that vary slowly in one direction, so they behave approximately like two-dimensional fields.Four types of light sources (an incandescent lamp, a white LED, a green LED, and a green laser) with different coherence properties were measured.The results of the method for nonparaxial fields are compared to those based on the paraxial approximation.
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Qi et al. (2024) studied this question.
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