Experimental analysis of the achromatic performance of a vector vortex coronagraph
Experimental analysis of the achromatic performance of a vector vortex coronagraph
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矢量涡旋日冕仪消色差性能实验分析
DOI：
10.1117/12.2561593
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发表时间：
2020
影响因子：
16.6
通讯作者：
Eldorado Riggs
中科院分区：
文献类型：
--
作者：
G. Ruane;E. Serabyn;C. Prada;Wesley Baxter;E. Bendek;D. Mawet;Eldorado Riggs
矢量涡旋日冕仪是一种设计用于在宽光谱范围内直接探测系外行星并对其进行光谱分析的仪器。我们的团队正在努力利用美国宇航局喷气推进实验室的高对比度成像测试台设施，展示与围绕太阳型恒星运行的温带类地行星成像相称的对比度性能。迄今为止，在可见光范围内（中心波长为 550 nm-750 nm），在 Δλ/λ=10% 的带宽内，实现的最佳宽带性能约为 10-8 原始对比度，而单色测试可产生更深的对比度（约 10-9 或更好）。在本研究中，我们分析了迄今为止测试台的主要性能限制，重点关注焦平面掩模制造的质量。我们测量掩模的偏振特性和黑洞中的残余电场作为波长的函数。我们的结果表明，当前的性能受到焦平面掩模中的局部缺陷的限制。新一代掩模正在接受测试，其缺陷更少，并有望提高性能。
The vector vortex coronagraph is an instrument designed for direct detection and spectroscopy of exoplanets over a broad spectral range. Our team is working towards demonstrating contrast performance commensurate with imaging temperate, terrestrial planets orbiting solar-type stars using the High Contrast Imaging Testbed facility at NASA's Jet Propulsion Laboratory. To date, the best broadband performance achieved is ~10-8 raw contrast over a bandwidth of Δλ/λ=10% in the visible regime (central wavelengths of 550 nm-750 nm), while monochromatic tests yield much deeper contrast (~10-9 or better). In this study, we analyze the main performance limitations on the testbeds so far, focusing on the quality of the focal plane mask manufacturing. We measure the polarization properties of the masks and the residual electric field in the dark hole as a function of wavelength. Our results suggest that the current performance is limited by localized defects in the in the focal plane masks. A new generation of masks is under test that have fewer defects and promise performance improvements.
DOI：
--
发表时间：
2010
期刊：
影响因子：
--
作者：
Haze;K.; Enya;K.; Kotani;T.; Abe;L.; Nakagawa;T.; Aono;K.; Sato;T.; Yamamuro;T.
通讯作者：
T.