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Figure 1
Drawing of a section of an elliptical kinoform lens. The step length L is equal to the ratio of the wavelength to the refractive index decrement. In a kinoform lens with a phase shift of 2π or 4π, L varies between 20 and 130 µm, depending on the energy and material (see Table 1[link]). The step width W decreases with increasing aperture, starting from a few micrometres at the lens centre. The additional thickness t added to the lens, for easier fabrication, is shown in grey. The lenses described in this paper have t = 4 µm.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 16| Part 3| March 2009| Pages 325-329
doi:10.1107/S0909049509003215
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