Abstract

A tunable two-color multilayer Bragg coating capable of simultaneously reflecting the fundamental and the third harmonic of an x-ray free-electron laser at the same angle and with high reflectance $R>0.70$ is presented. The novel coating will enable two-color x-ray pump/x-ray probe experiments. This mirror consists of a Si substrate that is coated with two different types of multilayer systems, $\mathrm{Mo}/{\mathrm{B}}_4\mathrm{C}$ layers with a periodicity of $d=3.2\mathrm{nm}$ directly on the substrate and $\mathrm{Ni}/{\mathrm{B}}_4\mathrm{C}$ layers with a periodicity of $d=11.85\mathrm{nm}$ on top. Fundamental radiation with photon energies between 3 and 9 keV is reflected by a $\mathrm{Ni}/{\mathrm{B}}_4\mathrm{C}$ multilayer system while the third harmonic ($9\mathrm{keV}<h\nu <27\mathrm{keV}$) passes this system and is reflected by the $\mathrm{Mo}/{\mathrm{B}}_4\mathrm{C}$ multilayers. The principle has successfully been proven at the beamline BM05 at ESRF.

© 2014 Optical Society of America

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