Abstract
Metal mirrors for precise optical applications are commonly fabricated by coating of a metal base substrate with a nickel-phosphorus alloy (NiP). The NiP layer is then processed by precision diamond turning and polishing to obtain a high-quality mirror surface. In this work, Ti-6Al-4V samples that were made by additive manufacturing, also called 3D printing, were used as a base for the development of metal mirrors. The additively manufactured samples were electroplated with a NiP coating and machined using single-point diamond turning (SPDT) to obtain a flat mirror with optical quality and low form error surface. The periodic structure of the SPDT toolmark was then removed by polishing postprocessing. Polishing optimization was first performed on NiP-coated aluminum test samples to find an optimal polishing setup. Based on this optimization, postprocessing of titanium samples was carried out by pitch polishing in combination with 1, 0.25, and $0.1\,\unicode{x00B5}{\rm m}$ diamond slurries. Using this polishing processing, a scratch-free surface was attained with surface microroughness below 0.5 nm.
© 2021 Optical Society of America
Full Article | PDF ArticleMore Like This
Yang Bai, Zhiyu Zhang, Donglin Xue, and Xuejun Zhang
Appl. Opt. 57(34) F62-F67 (2018)
Yang Bai, Zhiyu Zhang, Longxiang Li, Xiao Luo, Fukun Li, and Xuejun Zhang
Opt. Express 32(9) 15813-15826 (2024)
Z. Z. Li, J. M. Wang, X. Q. Peng, L. T. Ho, Z. Q. Yin, S. Y. Li, and C. F. Cheung
Appl. Opt. 50(16) 2458-2463 (2011)