光学学报, 2019, 39 (8): 0822001, 网络出版: 2019-08-07
一种新型keV波段超高分辨光栅光谱仪设计 下载: 1020次
Design of Novel KeV-Range Grating Spectrometer with Ultra-High Resolving Power
光学设计 光谱仪 X射线光学 光线追迹 衍射理论 像差分析与优化 optical design spectrometer X-ray optics ray tracing diffraction theory aberration analysis and optimization
摘要
国家自然科学基金(11475249)、国家“计划”青年项目基金(Y326021061);
Abstract
This paper presents a novel grating spectrometer design that combines a convexly cylindrical mirror with a concavely cylindrical varied line spacing grating to achieve an extreme resolving power of 33000-70000 in the photon energy range of 0.6-1.5 keV for a Gaussian light source with effective meridional size of 30 μm (root mean square) at an upstream initial object distance of 10 m. This type of spectrometer can be used to diagnose the radiation spectrum of a soft X-ray free electron laser and properly measure the spectral distribution and the detailed structure of the self-amplified spontaneous emission mode due to its extremely high resolving power. The overall optical aberrations of the system are well analyzed and compensated, providing an excellent flat field at the detector domain throughout the entire spectral range. A machine learning support vector machine algorithm is introduced into explore the optimal system to deliver the desired resolving performance. In addition, to enhance the spectral intensity and detection efficiency simultaneously, a sagittal confinement focusing mirror is introduced into the optical path of the spectrometer to reduce the astigmatism in spectral imaging.
李卓, 李宾. 一种新型keV波段超高分辨光栅光谱仪设计[J]. 光学学报, 2019, 39(8): 0822001. Zhuo Li, Bin Li. Design of Novel KeV-Range Grating Spectrometer with Ultra-High Resolving Power[J]. Acta Optica Sinica, 2019, 39(8): 0822001.