论文标题
用于直接成像系外行星(CIDRE)测试床1:概念,光学设置和自适应振幅暂停的实验结果
Coronagraphy for DiRect Imaging of Exoplanets (CIDRE) testbed 1: concept, optical set up, and experimental results of adaptive amplitude apodization
论文作者
论文摘要
即将到来的超级镜像摄像头和光谱仪(PC)的迎面式外球星镜(ELT)将旨在建立一类新的系外行星,包括围绕M矮人的地球行星,即在10^-8左右的近距离近似于0.1'。这可以通过冠状动脉来调节波前。经典的冠状动脉不是最佳的:1)它们施加行星光子损失,当乐器包括高光谱分辨率光谱仪时,尤其是有问题的,2)某些畸变,例如ELT缺失的片段,动态的段落是动态的,并且与静态的coronagraph设计不兼容,并且与静态区域的构图相关,3)范围内的范围仅是弹性的范围,则是光谱的耦合。检测器。这种仪器将受益于自适应工具,以在振幅和相位调节波前。我们建议在瞳孔平面中合并一个可变形的镜子(DM),以控制相位和数字微型摩尔装置(DMD),即由1920*1080的微型摩尔射击阵列,能够在两个位置之间切换,以控制其幅度。如果DM在该领域中特别是在自适应光学应用中众所周知,那么迄今为止尚未完全考虑DMD。在iPag,我们目前正在组装一个名为Cidre(用于直接成像外球星的冠状动脉)的测试床,以开发,测试,校准和验证这两个组件与lyot coronagraph的组合。自2022年3月以来,Cidre还是组装了,尽管没有Lyot Coronagraph。最初的几个月专门用于DMD的校准。自2022年5月以来,它是运行的,用于测试动态振幅冠状动脉(所谓的形状学生)。该程序介绍了Cidre Testbench的设置,以及对使用DMD获得的自适应形状学生的第一个实验结果。
Oncoming exoplanet spectro-imagers like the Planetary Camera and Spectrograph (PCS) for the Extremely Large Telescope (ELT) will aim for a new class of exoplanets, including Earth-like planets evolving around M dwarfs i.e., closer than 0.1'' with contrasts around 10^-8. This can be achieved with coronagraphs to modulate the wavefront. Classical coronagraphs are not optimal: 1) they impose a planetary photon loss, which is particularly problematic when the instrument includes a high spectral-resolution spectrograph, 2) some aberrations such as the missing segments of the ELT are dynamic and not compatible with a static coronagraph design, 3) the coupling of the exoplanet image with a fiber for spectroscopy only requires the electric field to be controlled on a small region of the detector. Such instruments would benefit from an adaptive tool to modulate the wavefront in both amplitude and phase. We propose to combine in the pupil plane a deformable mirror (DM) to control the phase and a digital micro-mirror device (DMD) i.e., an array made of 1920*1080 micro-mirrors able to switch between two positions, to control its amplitude. If the DM is already well-known in the field in particular for adaptive optics applications, the DMD has so far not been fully considered. At IPAG, we are currently assembling a testbed called CIDRE (Coronagraphy for DiRect Imaging of Exoplanets) to develop, test, calibrate, and validate the combination of these two components with a Lyot coronagraph. Since March 2022, CIDRE is assembled albeit without the Lyot coronagraph yet. The first few months have been dedicated to the calibration of the DMD. Since May 2022, it is operational and used to test dynamic amplitude apodization coronagraphs (so-called Shaped Pupils). This proceeding presents the set up of the CIDRE testbench and the first experimental results on adaptive Shaped Pupils obtained with the DMD.