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Laboratory Experiment of a High-contrast Imaging Coronagraph with New Step-transmission Filters
Jiangpei Dou; Deqing Ren; Yongtian Zhu; Xi Zhang
2008-08-19
Source PublicationTechniques and Instrumentation for Detection of Exoplanets IV
Volume7440
Issue7440
PagesVol.7440 19-1-8
Conference Date2008-8-2
Conference PlaceSan Diego, CA
Funding OrganizationThe International Society for Optical Engineering
PublisherSPIE
Abstract
We present the latest results of our laboratory experiment of the coronagraph with step-transmission filters. The primary goal of this work is to test the stability of the coronagraph and identify the main factors that limit its performance. At present, a series of step-transmission filters has been designed. These filters were manufactured with Cr film on a glass substrate with a high surface quality. During the process of the experiment of each filter, we have identified several contrast limiting factors, which includes the non-symmetry of the coating film, transmission error, scattered light and the
optical aberration caused by the thickness difference of coating film. To eliminate these factors, we developed a procedure for the correct test of the coronagraph and finally it delivered a contrast in the order of 10-6~10-7at an angular distance of 4λ/D, which is well consistent with theoretical design. As a follow-up effort, a deformable mirror has been manufactured to correct the wave-front error of the optical system, which should deliver better performance with an extra contrast improvement in the order of 10-2~10-3. It is shown that the step-transmission filter based coronagraph is promising for the high-contrast imaging of earth-like planets.
KeywordExtra-solar Planets High-contrast Imaging Coronagraph Step-transmission Filters Deformable Mirror
Subject Area系外行星探测
Document Type会议论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/575
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. Laboratory Experiment of a High-contrast Imaging Coronagraph with New Step-transmission Filters[C]:SPIE,2008:Vol.7440 19-1-8.
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