Figure 9
Longitudinal beam profiles from ptychographic measurements of a test structure, followed by ptychographic reconstruction and numerical propagation. The two upper plots (a), with horizontal and vertical profiles, show an astigmatic focus. After adjustment of the KB-mirror pitches, the focus becomes stigmatic as shown in the two lower plots (b). The right-hand side of every plot shows intensity images on logarithmic scale for the indicated best horizontal, respective vertical, focus positions. |