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Title:
A high-contrast imaging polarimeter with a stepped-transmission filter based coronagraph
Author: Liu, ChengChao(刘成超)1,2,4; Ren, DeQing(任德清)1,2,3; Zhu, YongTian(朱永田)1,2; Dou, JiangPei(窦江培)1,2; Guo Jing(郭晶)1,2
Source: Research in Astronomy and Astrophysics
Issued Date: 2016-05
Volume: 16, Issue:5, Pages:73-1-6
Keyword: polarimeter ; coronagraph ; polarimetric ; laboratory
Subject: 天文技术与方法
English Abstract:
The light reflected from planets is polarized mainly due to Rayleigh scattering, but starlight
is normally unpolarized. Thus it provides an approach to enhance the imaging contrast by inducing the imaging polarimetry technique.

In this paper, we propose a high-contrast imaging polarimeter that is optimized for the direct imaging of exoplanets, combined with our recently developed stepped-transmission filter based coronagraph.

Here we present the design and calibration method of the polarimetry system and the associated test of its high-contrast performance. In this polarimetry system, two liquid crystal variable retarders (LCVRs) act as a polarization modulator, which can extract the polarized signal.

We show that our polarimeter can achieve a measurement accuracy of about 0.2% at a visible wavelength (632.8 nm) with linearly polarized light. Finally, the whole system demonstrates that a contrast of 10-9 at 5/D is achievable, which can be used for direct imaging of Jupiter-like planets with a space telescope.
Language: 英语
Content Type: 期刊论文
URI: http://ir.niaot.ac.cn/handle/114a32/1351
Appears in Collections:中科院南京天光所知识成果_期刊论文
天文光谱和高分辨成像技术研究室_期刊论文

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description.institution: 1.南京天文光学技术研究所
2.中国科学院天文光学重点实验室
3.美国加州州立大学物理天文系
4.中国科学院大学

Recommended Citation:
Cheng-Chao Liu,De-Qing Ren,Yong-Tian Zhu,et al. A high-contrast imaging polarimeter with a stepped-transmission filter based coronagraph[J]. Research in Astronomy and Astrophysics,2016,16(5):73-1-6.
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文件名: A high-contrast imaging polarimeter with a stepped-transmission filter based coronagraph.pdf
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