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X-ray refractive lenses were successfully applied to harmonics rejection by using the fact that focal distance of the lens is
energy-dependent. Spatial separation of energy spectrum by focusing the fundamental harmonic at the focal point and
suppressing the unfocused high-energy radiation with a screen absorber or slit was achieved by usage of an off-axis
illumination of refractive lenses at the ESRF ID06 beam-line. The presence of the 3rd harmonic has been reduced down
to 10-3 using this technique and down to 10-5 by additionally using of monochromator detuning. The method is well
suited to third-generation synchrotron radiation sources and very promising at the future ultimate storage rings.
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