Abstract
The cross-spectral density function for radiation from three-dimensional extended sources is approximated by a modified Debye integral which implies that the radiated field obeys classical radiometry. The theory agrees with a recent detailed analysis of the radiation problem and provides the correct explicit expression for the specific intensity in terms of the Wigner distribution of the source. It also includes Wolf's correlation-dependent modification of the radiated spectrum.
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More From: Pure and Applied Optics: Journal of the European Optical Society Part A
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