Fig. 3: VKB defocus coefficient with and without AXL. | Nature Communications

Fig. 3: VKB defocus coefficient with and without AXL.

From: Alvarez varifocal X-ray lens

Fig. 3

The dots show the measured change in defocus coefficients of the outgoing wavefield of VKB with Alvarez X-ray lenses for different knife-edge positions ±16 mm around VKB’s focal length. The role of the AXL is apparent in keeping defocus term of the elliptical mirror constant which would otherwise vary linearly along the z direction.

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