Focal Plane Wavefront Sensing with the FAST TGV Coronagraph
Focal Plane Wavefront Sensing with the FAST TGV Coronagraph
复制标题
使用 FAST TGV Coronagraph 进行焦平面波前传感
DOI：
10.1088/1538-3873/ab84c9
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发表时间：
2020
影响因子：
3.5
通讯作者：
C. Marois
中科院分区：
文献类型：
--
作者：
B. Gerard;C. Marois
持续推动直接成像系外行星在较低的质量和更接近的分离围绕明亮的恒星轨道仍然受到准静态和残余自适应光学像差的限制。在以前的论文中，我们提出了一种修改的自相干相机（SCC）的设计，以解决这两个限制，称为快速大气SCC技术（FAST）。在本文中，我们介绍了一个额外的修改FAST焦平面掩模的设计，包括现有的倾斜/倾斜和高斯组件，并增加了一个电荷四涡（TGV）组件。除了提高SCC条纹的信噪比（S/N），在我们以前的设计，我们表明，快速TGV掩模也进行了优化，以达到高对比度的分离更接近星星。在本文中，我们使用数值模拟来考虑使用这种新的掩模校正准静态像差的性能改进相比，以前提出的提示/倾斜+高斯掩模。使用主动可变形反射镜控制来产生校准的半暗孔，在2-5 λ/D处将对比度提高约200倍，并且在5-20 λ/D处提高高达10倍。在本文中提出的新方法，现在同时考虑对比度和条纹S/N，打开了一个新的意识形态的电晕设计，电晕现在被认为是在二元性作为衍射衰减器和波前传感器的大门。
The continual push to directly image exoplanets at lower masses and closer separations orbiting around bright stars remains limited by both quasi-static and residual adaptive optics aberration. In previous papers we have proposed a modification of the self-coherent camera (SCC) design to address both of these limitations, called the Fast Atmospheric SCC Technique (FAST). In this paper we introduce an additional modification to the FAST focal plane mask design, including the existing Tip/tilt and Gaussian components and adding a charge four Vortex (TGV) component. In addition to boosting SCC fringe signal-to-noise ratio (S/N) as in our previous design, we show that the FAST TGV mask is also optimized to reach high contrast at separations closer to the star. In this paper we use numerical simulations to consider the performance improvement on correcting quasi-static aberration using this new mask compared to the previously proposed Tip/tilt+Gaussian mask. Using active deformable mirror control to generate a calibrated half dark hole improves contrast by a factor of about 200 at 2–5 λ/D and up to a factor of 10 at 5–20 λ/D. The new methodology presented in this paper, now simultaneously considering both contrast and fringe S/N, opens the door to a new ideology of coronagraph design, where the coronagraph is now considered in duality as both a diffraction attenuator and a wavefront sensor.