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Surface Texture Evolution of Fused Silica in a Combined Process of Atmospheric Pressure Plasma Processing and Bonnet Polishing

by 1, 1, 1, 1,*, 2,3,4, 2, 2,5 and 1,*
1
Centre for Precision Engineering, Harbin Institute of Technology, Harbin 150001, China
2
National Facility for Ultra Precision Surfaces, University of Huddersfield, Saint Asaph LL17 0JD, UK
3
Department of Physics and Astronomy, University College London, London WC1E 6BT, UK
4
Zeeko Ltd, Colville, Leicestershire LE67 3WF, UK
5
Research Center for Space Optical Engineering, Harbin Institute of Technology, Harbin 150001, China
*
Authors to whom correspondence should be addressed.
Coatings 2019, 9(10), 676; https://doi.org/10.3390/coatings9100676
Received: 30 August 2019 / Revised: 11 October 2019 / Accepted: 15 October 2019 / Published: 18 October 2019
(This article belongs to the Section Surface Characterization, Deposition and Modification)
The increasing demand for precision optical components invokes the requirement of advanced fabrication techniques with high efficiency. Atmospheric pressure plasma processing (APPP), based on chemical etching, has a high material removal rate and a Gaussian-shaped influence function, which is suitable to generate complex structures and correct form errors. Because of the pure chemical etching, an optically smooth surface cannot be achieved using only APPP. Thus, bonnet polishing (BP) with a flexible membrane tool, also delivering a Gaussian influence-function, is introduced to smooth the surface after APPP. In this paper, the surface texture evolution in the combined process of APPP and BP is studied. The etched texture with increased removal depth of APPP is presented and analyzed. Subsequently, the processed substrates are smoothed by BP. The texture smoothing and the roughness improvement is investigated in detail. The experimental results show that the APPP etched pits coalesce with each other and transform into irregular convex-concave structures, with roughness degraded to about 25 nm arithmetical mean deviation (Ra). The APPP etched texture can be successfully smoothed to 1.5 nm Ra, with 0.2–1 μm material removal of BP. View Full-Text
Keywords: optical surface; atmospheric pressure plasma processing; bonnet polishing; surface texture optical surface; atmospheric pressure plasma processing; bonnet polishing; surface texture
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MDPI and ACS Style

Su, X.; Ji, C.; Xu, Y.; Li, D.; Walker, D.; Yu, G.; Li, H.; Wang, B. Surface Texture Evolution of Fused Silica in a Combined Process of Atmospheric Pressure Plasma Processing and Bonnet Polishing. Coatings 2019, 9, 676. https://doi.org/10.3390/coatings9100676

AMA Style

Su X, Ji C, Xu Y, Li D, Walker D, Yu G, Li H, Wang B. Surface Texture Evolution of Fused Silica in a Combined Process of Atmospheric Pressure Plasma Processing and Bonnet Polishing. Coatings. 2019; 9(10):676. https://doi.org/10.3390/coatings9100676

Chicago/Turabian Style

Su, Xing, Chenglong Ji, Yang Xu, Duo Li, David Walker, Guoyu Yu, Hongyu Li, and Bo Wang. 2019. "Surface Texture Evolution of Fused Silica in a Combined Process of Atmospheric Pressure Plasma Processing and Bonnet Polishing" Coatings 9, no. 10: 676. https://doi.org/10.3390/coatings9100676

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