论文标题
对矢量涡流冠状动脉的出色表现的实验分析
Experimental analysis of the achromatic performance of a vector vortex coronagraph
论文作者
论文摘要
矢量涡流冠冕是一种仪器，旨在在广泛的光谱范围内直接检测和光谱。我们的团队正在使用NASA的JET推进实验室的高对比度成像测试台设施来证明与温带的陆地行星相称的对比性能。迄今为止，取得的最佳宽带性能是$ \ sim $ 10 $^{ - 8} $原始的对比度，在可见的状态（550-750 nm的中心波长）中的带宽$Δλ/λ$ = 10 \％，而单色测试的对比度，而单色测试的对比度更深（$ \ sim $ \ sim $ 10 $^$^^{-9}}。在这项研究中，我们分析了迄今为止测试台的主要性能限制，重点是焦平面掩模制造的质量。我们测量掩模的极化特性和暗孔中的残留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局部缺陷的限制。新一代的口罩正在测试，缺陷和承诺绩效的改善。
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 $\sim$10$^{-8}$ raw contrast over a bandwidth of $Δλ/λ$=10\% in the visible regime (central wavelengths of 550-750 nm), while monochromatic tests yield much deeper contrast ($\sim$10$^{-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.
