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![[Figure 4]](yi5084fig4mag.jpg)
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Figure 4
(a) Experimental layout at the AMO beamline of LCLS. The fractional Talbot wavefront sensor was placed after the sample interaction point. (b) Schematic of the wavefront sensor, which consists of a grating located 1.45 m from the interaction point, followed by a YAG scintillator located 1.16 m from the grating and a visible-light microscope. A scanning electron microscopy image of the silicon grating fabricated is shown to the right of the schematic. The 2D grating has a period of 40 µm and a duty cycle of 1:10, with 4 µm-wide square openings. Its 1% transmission limits heat load on the YAG scintillator to prevent damage (scale bar: 40 µm). (c) Recorded fractional Talbot images at 500 eV (left), 1000 eV (middle) and 1500 eV (right); scale bars are all 100 µm. |
![[Figure 4]](yi5084fig4.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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