Abstract
Energy conservation laws for statistical wavefields are first reviewed based on the following three models: electromagnetic theory scalar wave theory and radiometiy. These laws apply whether or not the coherence properties of the source generate shifts of spectral lines in the emitted radiation. Some subtleties are then noted which indicate why the spectrum of light is in general not conserved on propagation. We illustrate the results by considering fields produced by planar quasi-homogeneous secondary sources and by spherically symmetric sources of different states of coherence. * Research supported by the Department of Energy under grant # DE-FGO2-9OER 14119. The views expressed in this article do not constitute endorsement by DOE. ** Alsowith The Institute of Optics University of Rochester. SPIE Vol. 1319 Optics in Complex Systems (1990) / 59
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