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首页> 美国卫生研究院文献>Journal of Synchrotron Radiation >Diffraction gratings metrology and ray-tracing results for an XUV Raman spectrometer at FLASH
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Diffraction gratings metrology and ray-tracing results for an XUV Raman spectrometer at FLASH

机译：XASH拉曼光谱仪在FLASH上的衍射光栅计量和光线跟踪结果

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The extreme-ultraviolet double-stage imaging Raman spectrometer is a permanent experimental endstation at the plane-grating monochromator beamline branch PG1 at FLASH at DESY in Hamburg, Germany. This unique instrument covers the photon energy range from 20 to 200 eV with high energy resolution of about 2 to 20 meV (design values) featuring an efficient elastic line suppression as well as effective stray light rejection. Such a design enables studies of low-energy excitations like, for example, phonons in solids close to the vicinity of the elastic line. The Raman spectrometer effectively operates with four reflective off-axial parabolic mirrors and two plane-grating units. The optics quality and their precise alignment are crucial to guarantee best performance of the instrument. Here, results on a comprehensive investigation of the quality of the spectrometer diffraction gratings are presented. The gratings have been characterized by ex situ metrology at the BESSY-II Optics Laboratory, employing slope measuring deflectometry and interferometry as well as atomic force microscopy studies. The efficiency of these key optical elements has been measured at the at-wavelength metrology laboratory using the reflectometer at the BESSY-II Optics beamline. Also, the metrology results are discussed with respect to the expected resolving power of the instrument by including them in ray-tracing studies of the instrument.
机译：极紫外双级成像拉曼光谱仪是位于德国汉堡DESY FLASH平面光栅单色仪光束线分支PG1上的永久性实验终端站。这款独特的仪器涵盖20至200 eV的光子能量范围，约2至20 tomeV（设计值）的高能量分辨率，具有有效的弹性线抑制和有效的杂散光抑制能力。这样的设计使得能够研究低能激发，例如，靠近弹性线附近的固体中的声子。拉曼光谱仪可有效地与四个反射离轴抛物面反射镜和两个平面光栅单元一起工作。光学质量及其精确对准对于保证仪器的最佳性能至关重要。这里，给出了对光谱仪衍射光栅质量的全面研究的结果。 BESSY-II光学实验室已通过异位计量学对光栅进行了表征，该光栅采用了斜率测量偏折法和干涉法以及原子力显微镜研究。这些关键光学元件的效率已在波长计量实验室使用BESSY-II Optics光束线的反射仪进行了测量。另外，通过将测量结果包括在仪器的光线跟踪研究中，可以相对于仪器的预期分辨能力来讨论计量结果。

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