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Parallel Beam X-Ray Optics
Parallel Beam X-ray Optics
Parallel beam X-ray optics are artificial optical components with a 1-dimensional lattice deposited on a substrate. These optical devices convert a divergent incoming beam into a parallel one, or convert an incoming parallel beam into a focussing one.
To obtain high efficiency, the d-spacing of the lattice has to be changed from the front end to the rear end of the optics in correspondence to the figure of aspheric curvature. A parabolic figure is required to create a parallel beam. Either the X-ray source or the detector (or detector slit) may be placed at the optics focal distance, for primary or secondary side applications, respectively.
Fabrication of high precision 60 mm parallel beam optics both on prefigured substrates (right) and on flat substrates, which are glued and bend after deposition (left)
Parallel Beam X-ray Optics: Generation of a monochromatic 1-dimensional parallel beam
Beam path and main parameters of a parallel beam X-ray optics
Spectral lines Cr, Co, Cu, Mo, Ag (others on request)
Mean Reflectance R > 70 %
Monochromasy Ka1 + Ka2
Divergence Df < 0.03° (40 mm source width)
Mirror length L = 20 mm ... 80 mm (on customers request)
X-ray source geometry Line focus preferred
Parallel beam width b dependent on spectral line, geometry and mirror length:
b = 0.8 mm (Cu Ka, L = 40 mm)
b = 1.5 mm (Cu Ka, L = 80 mm)
Geometry distance source - mirror (middle pos.- xm)
standard mirror (L = 40 mm) xm = 90 mm
standard mirror (L = 60 mm) xm = 100 mm
Convex curved parallel beam multilayer optics of various geometries for the generation of a compressed monochromatic parallel beam in one dimension.
Convex curved parallel beam optics
Outstanding Feature:
Increase of the parallel beam photon flux in combination with a focusing optic by reduction of beam width b compared to conventional parallel beam optics
Spectral lines Cr, Co, Cu, Mo, Ag (others on request)
Mean Reflectance R > 70 %
Monochromasy Ka1 + Ka2
Mirror length L = 20 mm ... 80 mm (on customers request)
Compressed parallel beam width b
0.25 mm < b’ < 1.0 mm
X-ray source geometry Line focus preferred
Geometry customized
Beam path and main parameters of a convex curved parallel beam multilayer optics integrated in a beam compressor