A high-contrast imaging coronagraph for segmented-mirror large aperture telescopes using a spatial light modulator  

作　　者：Jiangpei Dou Huanyu Dong 

机构地区：[1]Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China [2]CAS Key Laboratory of Astronomical Optics&Technology,Nanjing Institute of Astronomical Optics&Technology,Nanjing 210042,China [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Astronomical Techniques and Instruments》2024年第3期166-170,共5页天文技术与仪器（英文）

基　　金：supported by the National Natural Science Foundation of China (U2031210 and 11827804);Science Research from the China Manned Space Project (CMS-CSST-2021-A11 and CMS-CSST-2021-B04).

摘　　要：The primary mirrors of current and future large telescopes always employ a segmented mirror configuration.The small but non-negligible gaps between neighboring segments cause additional diffraction,which restricts the performance of high-contrast coronagraph.To solve this problem,we propose a coronagraph system based on a single liquid crystal spatial light modulator(SLM).This spatial light modulator is used for amplitude apodization,and its feasibility and potential performance are demonstrated using a laboratory setup using the stochastic parallel gradient descent(SPGD)algorithm to control the spatial light modulator,which is based on point spread function(PSF)sensing and evaluation and optimized for maximum contrast in the discovery working area as a merit function.The system delivers a contrast in the order of 10−6,and shows excellent potential to be used in current and future large aperture telescopes,both on the ground and in space.

关 键 词：Liquid crystal spatial light modulator Amplitude apodized pupil Large aperture telescopes 

分 类 号：P111.41[天文地球—天文学]