Soiling induced nano-defects on aluminum telescope mirror coatings

被引：5
|
作者：
Willers, Guido [1 ]
Hagendorf, Christian [1 ]
Naumann, Volker [1 ]
Holzlohner, Ronald [2 ]
Guisard, Stephane [2 ]
机构：
[1] Fraunhofer Ctr Silicon Photovolta CSP, Otto Eissfeldt Str 12, D-06120 Halle, Saale, Germany
[2] European Southern Observ ESC, Karl Schwarzschild Str 2, D-85748 Garching, Germany
来源：
APPLIED OPTICS | 2022年 / 61卷 / 10期
关键词：
SURFACES; FORCES;
D O I：
10.1364/AO.452904
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Airborne contaminations on telescope mirrors are an important issue that is significantly affecting their reflectance, IR emissivity, and light scattering properties. Microscopic damage caused by environmental contaminants is of major interest for high-performance telescope mirror coatings. We have exposed unprotected Al coated mirrors under real operation conditions at the Very Large Telescope on Cerro Paranal/Chile for three years. The unique finding is that, in spite of a dry and low-dust environment, the reflective layers are damaged by interaction between dust particles on the Al mirror surface and capillary condensation. We analyze this particular damage mechanism at the microstructural level. (C) 2022 Optica Publishing Group
引用
收藏
页码：2727 / 2732
页数：6
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