Translator Disclaimer
Paper
30 August 2019 New candidate substrate materials for space mirror optics
Author Affiliations +
Abstract
This paper describes superior candidate substrate material- aluminum nitride (AlN), for the cost-effective and high-performance requirements for aerospace mirrors. In fact, high specific stiffness and thermal stability are not only two major considerations to select ideal material but also machinability, dimensional stability, and cost. Silicon carbide shows the best figure of merits 12627, but it has extremely low remove rate and expensive raw material properties. Extremely low expansion ceramics such as Zerodur may be difficult to obtain in large quantities and its figure of merit is 1151. On the contrary, AlN has outstanding thermal conductivity (~170 W/m°C) and maintain high figure of merit 2222 without compromise. In our fabrication processes, the AlN substrate can be easily polished to 53±1nm Ra surface texture and 66.4±2nm RMS surface form. Its unique thermal stability, specific stiffness, and good figure of merits, associated with its easy machinability and low-cost raw materials, makes AlN an ideal selection for superior mirror substrate in the future space mirror optics.
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hsing-Yu Wu, Wei-Che Chang, Po-Hsuan Huang, and Yi-Kai Huang "New candidate substrate materials for space mirror optics", Proc. SPIE 11101, Material Technologies and Applications to Optics, Structures, Components, and Sub-Systems IV, 111010L (30 August 2019); https://doi.org/10.1117/12.2530689
PROCEEDINGS
5 PAGES


SHARE
Advertisement
Advertisement
RELATED CONTENT

Study on optical polishing experiment of zerodur mirror
Proceedings of SPIE (August 06 2014)
Comparison of SiC mirror approaches
Proceedings of SPIE (September 30 2013)
NTSIC(New Technology SiC): the progress of recent two years
Proceedings of SPIE (November 21 2017)
SIC mirrors polishing
Proceedings of SPIE (November 17 2017)
Large Scale Fabrication Of Lightweight Si/SiC LIDAR Mirrors
Proceedings of SPIE (October 26 1989)

Back to Top