Quality of a refractive compound X-ray lens can be limited by imperfections in surfaces of unit lenses and stacking precision. In general case both the lens transmission and optical aberrations define properties of a beam in the lens exit plane; together they can be expressed in terms of the generalized pupil function. In this work we measure this function for a diamond single crystal compound refractive lens. Consequently, we apply the pupil function to evaluate the performance of the examined

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... compound refractive X-ray lens. A number of practically important conclusions can be drawn from such analysis. References and links 1. A. Snigirev, V. Kohn, I. Snigireva, A. Souvorov, and B. Lengeler, "Focusing high-energy x rays by compound refractive lenses," Appl. Opt. 37(4), 653-662 (1998). 2. B. Lengeler, J. Tümmler, A. Snigirev, I. Snigireva, and C. Raven, "Transmission and gain of singly and doubly focusing refractive x-ray lenses," J. Appl. Phys. 84(11), 5855-5861 (1998). 3. A. Snigirev, Y. Yunkin, I. Snigireva, M. Di Michiel, M. Drakopoulos, S. Kouznetsov, L. Shabel'nikov, M. Grigoriev, V. Ralchenko, I. Sychov, M. Hoffmann, and E. I. Voges, "Design and microfabrication of novel Xray optics," Proc. SPIE 4783, 1-9 (2002). 4. S. Terentyev