Figure 5
The normalized focus size [\sigma_{\rm{F}}/\sigma_{\rm{dl}}] (a), transverse coherence length [\xi_{\rm{F}}/\sigma_{\rm{F}}] (b), and global degree of coherence [\zeta_{\rm{F}}] in the focus (c) as functions of the ratio [\Omega/\Sigma_{\rm{L}}]. Different values of the global degree of coherence at the source [\zeta] = 1.0, 0.7, 0.4 and 0.2 are considered.  [article HTML]