论文标题
非常大的望远镜上的激光辅助断层扫描自适应光学系统的钥匙波前传感器功能
Key wavefront sensors features for laser-assisted tomographic adaptive optics systems on the Extremely Large Telescope
论文作者
论文摘要
激光导向星（LGS）波 - 前传感（LGSWFS）是断层扫描自适应光学系统的关键要素。但是，当考虑到极大的望远镜（ELT）尺度时，LGS点伸长变得如此之大，以至于挑战标准配方设计LGSWF。对于经典的Shack-Hartmann Wave-Front传感器（SHWFS），这是所有ELT LGS辅助仪器的当前基线，因此需要每个SA的瞳孔空间抽样[SA子量值（SAS）]和每个SAPLENS之间的折衷。对于ELT量表，这种权衡也受到强大的技术限制的驱动，尤其是有关可用探测器，尤其是它们的像素数量。对于SHWFS，每个SA的较大视野允许减轻LGS斑点截断，这代表了由于测量偏见而导致的性能严重丧失。对于给定数量的可用检测器像素，SA FOV与LGS点的适当采样和/或SAS总数竞争。我们提出了灵敏度分析，并探讨了这些参数如何影响最终性能。特别是，我们介绍了超级分辨率的概念，该概念允许人们减少每个WFS的瞳孔抽样，并为提出潜在的LGSWFS设计提供机会，从而为ELT量表提供最佳性能。
Laser guide star (LGS) wave-front sensing (LGSWFS) is a key element of tomographic adaptive optics system. However, when considering Extremely Large Telescope (ELT) scales, the LGS spot elongation becomes so large that it challenges the standard recipes to design LGSWFS. For classical Shack-Hartmann wave-front sensor (SHWFS), which is the current baseline for all ELT LGS-assisted instruments, a trade-off between the pupil spatial sampling [number of sub-apertures (SAs)], the SA field-of-view (FoV) and the pixel sampling within each SA is required. For ELT scales, this trade-off is also driven by strong technical constraints, especially concerning the available detectors and in particular their number of pixels. For SHWFS, a larger field of view per SA allows mitigating the LGS spot truncation, which represents a severe loss of performance due to measurement biases. For a given number of available detectors pixels, the SA FoV is competing with the proper sampling of the LGS spots, and/or the total number of SAs. We proposed a sensitivity analysis, and we explore how these parameters impacts the final performance. In particular, we introduce the concept of super resolution, which allows one to reduce the pupil sampling per WFS and opens an opportunity to propose potential LGSWFS designs providing the best performance for ELT scales.
