Pencils of rays in wave optics

Sudarshan , E. C. G. (1979) Pencils of rays in wave optics Physics Letters A, 73 (4). pp. 269-272. ISSN 0375-9601

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Every partially coherent field of illumination may be associated with a collection of generalized pencils of rays which, in turn, furnish a representation of the wave field. The hybrid Wolf function which represents the radiant energy of a thin pencil is shown to be a real, but not necessarily positive definite quantity. Such generalized pencils are used to represent certain familiar interferograms and recognize elementary results.

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