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A dark-hole correction test for the step-transmission filter based coronagraph system
Jiangpei Dou; Deqing Ren; Yongtian Zhu; Xi Zhang; Rong Li
2012-08-22
Source PublicationSpace Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave
Volume8442
Issue8442
PagesVol.8442 0D-1-7
Conference Date2012-7-1
Conference PlaceAmsterdam, Netherland
Funding OrganizationThe International Society for Optical Engineering
PublisherSPIE
Abstract
We present the initial test of the dark-hole correction for the high-contrast imaging coronagraph that is based on the steptransmission filter. The dark hole is created by a 12x12 actuator deformable mirror (DM) that has been put in the conjugate plane of the pupil image of the coronagraph. In this test, we use the stochastic parallel gradient descent (SPGD) optimization algorithm to directly control the DM to provide an optimal phase to minimize the intensity in target regions, where the dark hole is created and the contrast can be enhanced. For demonstration purpose, the test is carried out in a single wavelength and should be improved in next step for broad-band high-contrast imaging. Finally, it is shown in the test that an extra contrast ~50 times improvement has reached in the dark hole in the coronagraphic image plane. Such a technique could be used for a future space-based high-contrast observation and is promising for the direct imaging of an Earth-like exoplanet.
KeywordEarth-like Exoplanets Dark-hole Correction High-contrast Coronagraph Spgd Algorithm
Subject Area系外行星探测
Document Type会议论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/632
Collection中国科学院南京天文光学技术研究所_会议论文
天文光谱和高分辨成像技术研究室_会议论文
Recommended Citation
GB/T 7714
Jiangpei Dou,Deqing Ren,Yongtian Zhu,et al. A dark-hole correction test for the step-transmission filter based coronagraph system[C]:SPIE,2012:Vol.8442 0D-1-7.
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