REFRACTIVE X-RAY LENSES

Refractive x-ray lenses are available from RXOPTICS as rotationally parabolic (2D) and as cylinder parabolic (1D) lenses, focusing in both directions or only in one direction.

Attenutation of x-rays in lens materials
Fig. 1. Attenuation of x-rays in lens materials

The lenses can be used in a very wide energy range from about 2 keV to about 150 keV. Beryllium is the material of choice up to about 40 keV. Roughly from 40 to 80 keV aluminium is more appropriate. Beyond these energies nickel is used (on request). In Figure 1 is shown the attenuation of x-rays in these materials. The power-law behavior due to photo absorption is limited by Compton scattering that becomes dominant at higher energies. To the right of the knee in the absorption curves the background radiation gets too strong. Hence, the lenses should be operated in the energy range to the left of the respective knee.

The following lenses are available from RXOPTICS. The 2D-lenses have a circular frame with a diameter of 12 mm. The 1D-lenses have a quadratic frame of 20×20 mm2. In the near future all the 1D lenses will have a length of at least 2 mm; at present, this is true except for the 1D lenses with R = 200 μm and R = 300 μm which have a length of at least 1.3 mm.


Be 2D-lenses Al 2D-lenses Be 1D-lenses Al 1D-lenses
R (μm) Geometric
aperture (mm)
R (μm) Geometric
aperture (mm)
R (μm) Geometric
aperture (mm)
R (μm) Geometric
aperture (mm)
50 0.4 50 0.4
100 0.6 100 0.6 100 0.6
200 0.9 200 0.9 200 0.6 200 0.9
300 1.1 300 1.1 300 0.8 300 1.1
500 1.4 500 1.4 500 1.0 500 1.4
1000 1.9 1000 1.9 1000 1.7
1500 2.4
2000 2.8
2500 2.5
3000 2.7
4000 3.1
5000 2.9
5800 3.1

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