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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
会议录名称Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave
卷号8442
期号8442
页码Vol.8442 0D-1-7
会议日期2012-7-1
会议地点Amsterdam, Netherland
会议主办者The International Society for Optical Engineering
出版者SPIE
摘要
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.
关键词Earth-like Exoplanets Dark-hole Correction High-contrast Coronagraph Spgd Algorithm
学科领域系外行星探测
文献类型会议论文
条目标识符http://ir.niaot.ac.cn/handle/114a32/632
专题会议论文
推荐引用方式
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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