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Figure 6
(a) Far-field pattern for one angular position of the WG. The intensity in arbitrary units is given in gray scale (color in the on-line version) as a function of the detector pixel in the X (horizontal) and Y (vertical) directions. Along X the beam acquires a divergence of the order of λ/d because of diffraction at the exit of the WG. In the y direction the beam maintains its natural divergence of about 3 µrad. (b) Beam profile in the horizontal direction obtained by integrating the intensity distribution in (a) for 21 pixels along y. From the measure of the cross-section width it is possible to roughly derive the gap value d, resulting in about 240 nm.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 20| Part 5| July 2013| Pages 691-697
doi:10.1107/S0909049513018657
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