End-to-end computational design for an EUV solar corona multispectral imager with stray light suppression  

作　　者：Jinming Gao Yue Sun Yinxu Bian Jilong Peng Qian Yu Cuifang Kuang Xiangzhao Wang Xu Liu Xiangqun Cui 

机构地区：[1]State Key Laboratory of Extreme Photonics and Instrumentation,College of Optical Science and Engineering,Zhejiang University,Hangzhou 310027,China [2]ZJU-Hangzhou Global Scientific and Technological Innovation Center,Zhejiang University,Hangzhou 310027,China [3]Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China [4]Beijing Environmental Satellite Engineering Institute,Beijing 100094,China

出　　处：《Astronomical Techniques and Instruments》2024年第1期31-41,共11页天文技术与仪器（英文）

基　　金：This study is partially supported by the National Natural Science Foundation of China(NSFC)(62005120,62125504).

摘　　要：An extreme ultraviolet solar corona multispectral imager can allow direct observation of high temperature coronal plasma,which is related to solar flares,coronal mass ejections and other significant coronal activities.This manuscript proposes a novel end-to-end computational design method for an extreme ultraviolet(EUV)solar corona multispectral imager operating at wavelengths near 100 nm,including a stray light suppression design and computational image recovery.To suppress the strong stray light from the solar disk,an outer opto-mechanical structure is designed to protect the imaging component of the system.Considering the low reflectivity(less than 70%)and strong-scattering(roughness)of existing extreme ultraviolet optical elements,the imaging component comprises only a primary mirror and a curved grating.A Lyot aperture is used to further suppress any residual stray light.Finally,a deep learning computational imaging method is used to correct the individual multi-wavelength images from the original recorded multi-slit data.In results and data,this can achieve a far-field angular resolution below 7",and spectral resolution below 0.05 nm.The field of view is±3 R_(☉)along the multi-slit moving direction,where R☉represents the radius of the solar disk.The ratio of the corona's stray light intensity to the solar center's irradiation intensity is less than 10-6 at the circle of 1.3 R_(☉).

关 键 词：EUV solar corona imager Curved grating Stray light suppression Computational multispectral imaging 

分 类 号：TH744.1[机械工程—光学工程]