Poletto L, Tondello G
Appl Opt. 2000 Nov 1;39(31):5671-8. doi: 10.1364/ao.39.005671.
An optical design for spherical-grating monochromators for application to synchrotron radiation is presented. High spectral and spatial performance is obtained with a spherical variable-line-spaced grating coupled to a spherical mirror with its tangential plane coincident with the grating's equatorial plane. The monochromator works without an entrance slit in an off-Rowland configuration with a fixed entrance arm and demagnification on the exit slit. The law for groove-space variation of the grating compensates for the main spectral aberrations; spectral focusing in an extended energy range is ensured by a slight change in the exit arm with translations of the order of a few tens of millimeters. The inclusion of a spherical mirror ensures focusing on a plane perpendicular to the plane of spectral dispersion. The ultimate resolution is limited by the slope errors of a single spherical surface. The layout is applied to the design of a high-resolution monochromator for the 1000-250-eV region.
本文介绍了一种应用于同步辐射的球面光栅单色仪的光学设计。通过将球面变线距光栅与球面镜耦合，使球面镜的切平面与光栅的赤道平面重合，可获得高光谱和空间性能。该单色仪在非罗兰配置下工作，无需入口狭缝，具有固定的入口臂且对出口狭缝进行缩小成像。光栅槽间距变化规律补偿了主要光谱像差；通过出口臂几十毫米量级的平移产生的微小变化，确保了在扩展能量范围内的光谱聚焦。包含球面镜可确保在垂直于光谱色散平面的平面上聚焦。最终分辨率受单个球面的斜率误差限制。该布局应用于1000 - 250 eV区域的高分辨率单色仪设计。
