Trapezoidal phase mask coronagraph

发布时间：2018-01-13 09:03

  本文关键词：Trapezoidal phase mask coronagraph　出处：《Chinese Optics Letters》2015年02期 　论文类型：期刊论文

  更多相关文章： singularity wideband abrupt throughput elimination planet angular eliminate coordinates bandwidth

【摘要】：An angular trapezoidal phase mask used for a wideband coronagraph is proposed. The azimuthal phase of the mask is double-periodic and has both trapezoidal and constant parts in each period. This kind of continuous phase distribution can be employed to avoid the abrupt phase variation of the 6-level phase distribution we proposed previously. Numerical calculations show that this more practical phase mask can still keep its superior performance in terms of starlight elimination, small inner working angle, and good achromatism. It is of great importance that there is no singularity in this kind of mask except for a singularity at the center. This mask design is close to real manufacturing conditions, and the process technology is superior.
[Abstract]:An angular trapezoidal phase mask used for a wideband coronagraph is proposed. The azimuthal phase of the mask is double-periodic and has both trapezoidal and constant parts in each period. This kind of continuous phase distribution can be employed to avoid the abrupt phase variation of the 6-level phase distribution we proposed previously. Numerical calculations show that this more practical phase mask can still keep its superior performance in terms of starlight elimination, small inner working angle, and good achromatism. It is of great importance that there is no singularity in this kind of mask except for a singularity at the center. This mask design is close to real manufacturing conditions, and the process technology is superior.
【作者单位】： Department
【分类号】：P182.6
【正文快照】： Direct imaging of an exoplanet is very hard to obtain,be-cause the host star of the target planet is usually 1010times brighter in the visible region(104 107times in theinfrared region)than the Earth-like exoplanet.Corona-graphs can largely eliminate th

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