Coating Thin Mirror Segments for Lightweight X-ray Optics

被引：19

作者：

Chan, Kai-Wing ^{[1
]}

Sharpe, Marton ^{[1
]}

Zhang, William ^{[1
]}

Kolos, Linette ^{[1
]}

Hong, Melinda ^{[1
]}

McClelland, Ryan ^{[1
]}

Hohl, Bruce R. ^{[1
]}

Saha, Timo ^{[1
]}

Mazzarella, James ^{[1
]}

机构：

[1] Ctr Res & Explorat Space Sci & Technol, Baltimore, MD 21250 USA

来源：

OPTICS FOR EUV, X-RAY, AND GAMMA-RAY ASTRONOMY VI | 2013年 / 8861卷

关键词：

Metallic thin-film deposition; coating stress; x-ray optics; lightweight mirrors; segmented mirrors;

D O I：

10.1117/12.2022444

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Next generation's lightweight, high resolution, high throughput optics for x-ray astronomy requires integration of very thin mirror segments into a lightweight telescope housing without distortion. Thin glass substrates with linear dimension of 200 mm and thickness as small as 0.4 mm can now be fabricated to a precision of a few arc-seconds for grazing incidence optics. Subsequent implementation requires a distortion-free deposition of metals such as iridium or platinum. These depositions, however, generally have high coating stresses that cause mirror distortion. In this paper, we discuss the coating stress on these thin glass mirrors and the effort to eliminate their induced distortion. It is shown that balancing the coating distortion either by coating films with tensile and compressive stresses, or on both sides of the mirrors is not sufficient. Heating the mirror in a moderately high temperature turns out to relax the coated films reasonably well to a precision of about a second of arc and therefore provide a practical solution to the coating problem.

引用

页数：12

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