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Figure 4
(a) Focus is diffraction-limited [\sigma_{\rm{F}}] = [\sigma_{\rm{dl}}] if the beam size [\Sigma_{\rm{L}}] and transverse coherence length [\Xi_{\rm{L}}] are larger than the lens aperture Ω. (b, c) Focus size is larger than the diffraction limit if the coherence length (b) or beam size (c) incident on the lens is smaller than the aperture. (d) For a very large aperture the focus is a demagnified image of the source.

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