Roling S, Braun S, Gawlitza P, Wöstmann M, Ziegler E, Zacharias H
Opt Lett. 2014 May 1;39(9):2782-5. doi: 10.1364/OL.39.002782.
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, Mo/B4C layers with a periodicity of d=3. nm directly on the substrate and Ni/B4C layers with a periodicity of d=11.85 nm on top. Fundamental radiation with photon energies between 3 and 9 keV is reflected by a Ni/B4C multilayer system while the third harmonic (9 keV<hν<27 keV) passes this system and is reflected by the Mo/B4C multilayers. The principle has successfully been proven at the beamline BM05 at ESRF.
本文介绍了一种可调谐双色多层布拉格涂层，它能够以相同角度且高反射率R>0.70同时反射X射线自由电子激光的基波和三次谐波。这种新型涂层将使双色X射线泵浦/ X射线探测实验成为可能。该反射镜由硅衬底组成，在衬底上涂覆有两种不同类型的多层系统，直接在衬底上是周期为d = 3nm的Mo/B4C层，顶部是周期为d = 11.85nm的Ni/B4C层。光子能量在3至9keV之间的基波辐射由Ni/B4C多层系统反射，而三次谐波（9keV < hν < 27keV）穿过该系统并由Mo/B4C多层反射。该原理已在欧洲同步辐射装置（ESRF）的BM05光束线上成功得到验证。
