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Figure 4
(a) Reflectivity versus photon wavelength of the currently installed multilayer mirrors. Blue: manufacturer data (measured by PTB@BESSY II); yellow and green: total reflectivity of pump-beam path and probe-beam path, calculated by M1 * M3 and M2 * M3, respectively. Here a reflectivity of 41% is reached at 13.5 nm. At a geometrical split-ratio of 50%/50%, each beam transmits ∼20% of the originally incident photons. (b) Geometrical dimensions of the mirrors.

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