论文标题
快速TGV Coronagraph感应焦平面波前传感
Focal Plane Wavefront Sensing with the FAST TGV Coronagraph
论文作者
论文摘要
持续的推动直接在较低的质量和围绕明亮恒星周围的近距离分离处直接成像系外行星仍然受到准静态和残留自适应光学（AO）畸变的限制。在以前的论文中，我们提出了对自相机（SCC）设计的修改，以解决这两个局限性，称为快速大气SCC技术（快速）。在本文中，我们对快速焦平面掩码设计进行了额外的修改，包括现有的尖端/倾斜和高斯组件，并添加充电四个涡流（TGV）组件。除了在我们以前的设计中提高SCC条纹信噪比（S/N）外，我们还表明，快速TGV掩码也被优化，以达到更接近恒星的分离处的高对比度。在本文中，我们使用数值仿真来考虑使用此新掩码纠正准静态像差的性能改进，与先前提出的尖端/倾斜+高斯掩码相比。使用主动变形镜控制产生校准的半深孔，在2-5 $λ/d $时提高了约200倍的对比，并在5-20美元$λ/d $的情况下达到10倍。本文中提出的新方法（现在同时考虑对比度和边缘S/N）打开了新的Coronagraph设计意识形态的大门，在该设计中，现在双重性将冠状动力视为衍射衰减器和波浪方面传感器。
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 (AO) 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.
