Abstract
We study effective spatial and angular correlations in beams of any state
of spatial coherence, and we introduce a phase-space product, , which takes these correlations into account. This phase-space
product is shown to reduce to the conventional beam-quality factor when the beam is spatially fully coherent. We also determine the
lower bound for the value of and demonstrate that it is attained for all Gaussian Schell-model
beams.
© 2001 Optical Society of America
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