We analyze the focusing of wave fields of any state of coherence by systems with low Fresnel numbers. We study the optical intensity on the axis in the focal region. The dependence of the focal shift and of the maximum on-axis intensity on the state of coherence is examined for some model fields. © 2001 Elsevier Science B.V. All rights reserved.
Friberg, A. T., Visser, T. D., Wang, W., & Wolf, E. (2001). Focal shifts of converging diffracted waves of any state of spatial coherence. Optics Communications, 196(1–6), 1–7. https://doi.org/10.1016/S0030-4018(01)01378-5