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Figure 2
Top: ptychographically reconstructed beam profile at the sample position (here the pinhole took the place of the sample). The extracted vertical and horizontal beam profiles are shown in blue and the fitted Gaussians, from which the full widths at half-maximum (FWHM) of 13.4 µm and 31.8 µm were measured, are shown in orange. Bottom: numerically downstream propagated and projected beam intensity profiles, revealing the relative focus positions and focus sizes (FWHM): 13 µm at 1 m (vertical) and 22 µm at 3 m (horizontal).

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ISSN: 1600-5775
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