Laboratory Experiment of a High-contrast Imaging Coronagraph with New Step-transmission Filters
文献类型:会议论文
作者 | Jiangpei Dou; Yongtian Zhu; Xi Zhang; Deqing Ren |
出版日期 | 2008-08-19 |
会议日期 | 2008-8-2 |
会议地点 | San Diego, CA |
关键词 | extra-solar planets high-contrast imaging coronagraph step-transmission filters deformable mirror |
卷号 | 7440 |
期号 | 7440 |
页码 | Vol.7440 19-1-8 |
英文摘要 |
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. |
会议主办者 | The International Society for Optical Engineering |
会议录 | Techniques and Instrumentation for Detection of Exoplanets IV |
会议录出版者 | SPIE |
学科主题 | 系外行星探测 |
源URL | [http://ir.niaot.ac.cn/handle/114a32/575] |
专题 | 会议论文 |
推荐引用方式 GB/T 7714 | Jiangpei Dou,Yongtian Zhu,Xi Zhang,et al. Laboratory Experiment of a High-contrast Imaging Coronagraph with New Step-transmission Filters[C]. 见:. San Diego, CA. 2008-8-2. |
入库方式: OAI收割
来源:南京天文光学技术研究所
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