
Figure 2
The propagation geometry. The partially coherent source with a source size and coherence length is positioned at z_{0}. Partially coherent radiation with the beam size , coherence length and radius of curvature R_{L} is incident on the lens at z_{L}. The beam size and the radius of curvature are modified by the transmission through the lens. The beam is focused at the focal position z_{F} with the focus size and coherence length _{F}. The beam parameters at an arbitrary position z_{1} downstream of the lens are determined. 