Abstract
Based on the propagation law of partially coherent beams, the propagation equations of J 0-correlated Schell-model (JSM) beams through a paraxial optical ABCD system are derived and expressed in closed-form. The free-space propagation and focusing of JSM beams are regarded two special cases of our result. The focusing properties, in particular, the focal shift of JSM beams are studied, and illustrative numerical results are given. It is found that the focal shift of JSM beams, which is determined by an algebraic equation of 3rd order, increases with decreasing Fresnel number N and increasing parameter σ.
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