Shorter X-ray refractive lens design: a large-aperture single-lens dual-focus kinoform lens based on an oval curved surface

Zhang, Y.; Xu, Y.; Zhang, T.; Wang, B.; Wu, L.; Yi, F.; Lin, H.; Liu, J.

doi:10.1107/S1600577526007551

Figure 3
Schematic diagram of the OK3 lens focusing mechanism, showing the collaborative focusing behavior of the (n − 1)th and nth kinoform lenses in the cascaded system, where n = 2, 3, 4,…. Key parameters include y_n (axial length of the nth lens), A_n (aperture diameter of the nth lens), w_n−1 [overlap length between the (n − 1)th lens and the nth lens; in this figure, w_n−1 = 0], d_n (thickness of the nth kinoform lens), q_n11 (pre-focusing focal length at the left-hand surface of the nth lens), q_n12 (post-focusing focal length at the left-hand surface of the nth lens), q_n21 (pre-focusing focal length at the right-hand surface of the nth lens) and q_n22 (post-focusing focal length at the right-hand surface of the nth lens), with subscript indices systematically denoting lens position and optical state.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 33| Part 5| September 2026|

https://doi.org/10.1107/S1600577526007551

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