Advanced environmentally resistant lithium fluoride mirror coatings for the next generation of broadband space observatories

Fleming Brian; Quijada Manuel; Hennessy John; Egan Arika; Del Hoyo Javier; Hicks Brian A.; Wiley James; Kruczek Nicholas; Erickson Nicholas; France Kevin

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Advanced environmentally resistant lithium fluoride mirror coatings for the next generation of broadband space observatories

机译：用于下一代宽带空间观察者的先进的环保型耐氟化锂涂层

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Recent advances in the physical vapor deposition (PVD) of protective fluoride films have raised the far-ultraviolet (FUV: 912-1600 angstrom) reflectivity of aluminum-based mirrors closer to the theoretical limit. The greatest gains, at more than 20%, have come for lithium fluoride-protected aluminum, which has the shortest wavelength cutoff of any conventional overcoat. Despite the success of the NASA FUSE mission, the use of lithium fluoride (LiF)-based optics is rare, as LiF is hygroscopic and requires handling procedures that can drive risk. With NASA now studying two large mission concepts for astronomy, Large UV-Optical-IR Surveyor (LUVOIR) and the Habitable Exoplanet Imaging Mission (HabEx), which mandate throughput down to 1000 A, the development of LiF-based coatings becomes crucial. This paper discusses steps that are being taken to qualify these new enhanced LiF-protected aluminum (eLiF) mirror coatings for flight. In addition to quantifying the hygroscopic degradation, we have developed a new method of protecting eLiF with an ultrathin (10-20 angstrom) capping layer of a non-hygroscopic material to increase durability. We report on the performance of eLiF-based optics and assess the steps that need to be taken to qualify such coatings for LUVOIR, HabEx, and other FUV-sensitive space missions. (C) 2017 Optical Society of America

机译：保护氟化物膜的物理气相沉积（PVD）的最新进展已经提高了铝基镜的远紫外（FUV：912-1600埃）更接近理论极限的反射率。最大的收益，超过20％，已经用于氟化锂保护的铝，其具有任何常规外涂层的最短波长截止。尽管NASA保险丝任务成功，但基于氟化锂（LIF）的光学器件罕见，因为LIF是吸湿的，并且需要处理可以推动风险的程序。随着美国宇航局的目前为天文学，大型紫外线 - 光反射法测量师（Luvoir）和可居住的外出成像使命（Habex）进行了两个大型任务概念，该使命授权吞吐量为1000A，基于LiF的涂料的发展变得至关重要。本文讨论了所采取的步骤，以资格获得这些新的增强型Lif-Preded铝（ELIF）镜涂层的飞行。除了量化吸湿性降解之外，我们开发了一种用超吸湿材料的超吸湿材料（10-20埃）覆盖层保护ELIF的新方法，以提高耐久性。我们报告了基于Elif的光学的表现，并评估了需要采取的步骤，以资格获得Luvoir，Habex和其他FUV敏感空间任务的这种涂层。（c）2017年光学学会

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《Applied optics》 |2017年第36期|共10页
作者
Fleming Brian; Quijada Manuel; Hennessy John; Egan Arika; Del Hoyo Javier; Hicks Brian A.; Wiley James; Kruczek Nicholas; Erickson Nicholas; France Kevin;
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Univ Colorado Lab Atmospher &

Space Phys 3665 Discovery Dr Boulder CO 80303 USA;

NASA Goddard Space Flight Ctr 8800 Greenbelt Rd Greenbelt MD 20771 USA;

CALTECH Jet Prop Lab 4800 Oak Grove Dr Pasadena CA 91109 USA;

Univ Colorado Lab Atmospher &

Space Phys 3665 Discovery Dr Boulder CO 80303 USA;

NASA Goddard Space Flight Ctr 8800 Greenbelt Rd Greenbelt MD 20771 USA;

NASA Goddard Space Flight Ctr 8800 Greenbelt Rd Greenbelt MD 20771 USA;

Univ Colorado Lab Atmospher &

Space Phys 3665 Discovery Dr Boulder CO 80303 USA;

Univ Colorado Lab Atmospher &

Space Phys 3665 Discovery Dr Boulder CO 80303 USA;

Univ Colorado Ctr Astrophys &

Space Astron 389 UCB Boulder CO 80309 USA;

Univ Colorado Lab Atmospher &

Space Phys 3665 Discovery Dr Boulder CO 80303 USA;

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Advanced environmentally resistant lithium fluoride mirror coatings for the next generation of broadband space observatories

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