Abstract

Abstract Radiation efficiency, which is defined as the total power radiated from a source normalized to a maximum value of unity, is investigated theoretically for a partially coherent three-dimensional source. The source model for analysis is assumed to be a primary, homogeneous, isotropic spherical source, and its spatial correlation is characterized by means of properly arranged Bessel functions. A number of representative curves of the radiation efficiency are illustrated as a function of the coherence condition of the source and compared with the curves of the radiation efficiency for the planar source whose spatial coherence is specified by the same functional form of Bessel functions. It is found from such comparison that there exists a kind of reciprocal behaviour in radiation efficiency between the three-dimensional source and the planar one.

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