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

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外文摘要：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.

外文关键词：

Liquid crystal spatial light modulatorAmplitude apodized pupilLarge aperture telescopes

作者：

Jiangpei Dou、Huanyu Dong

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作者单位：

Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China

CAS Key Laboratory of Astronomical Optics&Technology,Nanjing Institute of Astronomical Optics&Technology,Nanjing 210042,China

University of Chinese Academy of Sciences,Beijing 100049,China

出版年：

2024

DOI：