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Hybrid Lyot coronagraph masks and wavefront control for improved spectral bandwidth and throughput

机译:混合Lyot冠冕仪掩模和波前控制可改善光谱带宽和通量

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摘要

Coronagraph focal-plane occulting masks have generally been described as attenuation profiles free of any phase shift. However, phase shifts are expected and observed in physical occulting masks, and they can impose significant limitations on coronagraph contrast at the billion-to-one level in spectrally broad light, as required for the direct imaging of planetary systems orbiting the nearby stars. Here we explore design options for a physically realizable occulting mask composed of a metallic and a dielectric thin film, each profiled in thickness and superimposed on a glass substrate. We show that such hybrid masks, together with a deformable mirror for control of wavefront phase, offer contrast performance better than 10'9 over spectral bandwidths up to 30% with Lyot coronagraph throughput efficiencies of 66% or more.
机译:通常将日冕仪焦平面掩蔽掩模描述为没有任何相移的衰减曲线。但是,在物理掩星中会发现并观察到相移,并且相移会在光谱宽广的光线中以十亿比一的水平对日冕仪对比度施加重大限制,这是对绕着附近恒星运行的行星系统进行直接成像所必需的。在这里,我们探讨了由金属和介电薄膜组成的可物理掩盖的掩膜的设计方案,掩膜的厚度各异,并叠加在玻璃基板上。我们表明,这种混合掩模与可变形反射镜一起用于控制波前相位,在高达30%的频谱带宽上提供了优于10'9的对比度,而Lyot冠状动脉造影仪的吞吐效率达到66%或更高。

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