In recent years the propagation of wavefields generated by sources having controlled states of coherence has attracted a great amount of attention. This interest has been motivated by a number of potentially useful applications such as the reduction of speckle effects. In much of this research the highly directional beams generated by certain planar sources, known as Gaussian Schell-model sources, are seen to play a central role. These source models are not only capable of representing sources with states of coherence ranging from fully coherent to essentially incoherent, but they also lend themselves to analysis (forming a two-parameter system) thereby providing an insight into the nature of partially coherent beams. Additionally, sources of this type are readily produced in the laboratory.1, 2
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