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Figure 3
(a) Complex field of the probe of the low-photon-flux data set 1 (cf. Table 1[link] and Fig. 5[link]) propagated to the focal plane. Amplitude and phase are drawn according to the colour bar next to the image. In (b) and (c) line cuts through the vertical and horizontal direction of the probe intensity in the focus (a) are drawn, respectively. Gaussian fits to the curves (red lines) yield FWHM = 393 nm and FWHM = 292 nm in (b) and (c), respectively. (d) Sharpness and fit for estimation of the DOF. (e) shows the horizontal slice of the probe intensity through the focus. (f) presents the vertical slice. The scale bar in (a) denotes 500 nm.

ISSN: 2053-2733
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