Monochromators with Aperiodic Layer Stacks - Broadband Mirrors

Tailored depth-graded multilayers
- Multilayer with large number of different bilayer thicknesses di to fulfill Bragg’s law for many photon energies / wavelengths
- Broadband or bandpass reflectors possible
- Energy bandwidths of 20% and more feasible, for example
- Can be optimized for photon energies from EUV up to hard X-rays (80 keV and more)
- Selected bandwidth is maintained even if energy and corresponding incidence angle are changed
- Adaptation of the energy band to the source spectrum possible
- Large photon flux due to the collection of a large portion of the source spectrum e.g. at bending magnets




Reflected wavelength spectrum for a 17% bandwidth mirror around 4.13 nm (300 eV) at 45° incidence angle for polarization measurements with a laser plasma source (red: measurement, black: simulation)



Reflectivity vs. grazing angle for a 22% bandwidth multilayer mirror at 22.2 keV (red: measurement, black: simulation)



Reflectivity vs. grazing angle for a 21% bandwidth synchrotron mirror around 40 keV (red: measurement, black: simulation)





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