Ultra-precision polishing of electroless nickel molding dies for shorter wavelength applications |
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Authors: | Y Namba A Beaucamp H Kunieda K Yamashita |
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Affiliation: | a Department of Mechanical Engineering, Chubu University, 1200 Matsumotocho, Kasugai, Aichi 487 8501, Japan b Department of Physics, Nagoya University, Nagoya, Japan |
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Abstract: | Electroless nickel is one of the best materials for making optical molding dies, because of its machinability with both single-point diamond turning and polishing, as well as its suitable hardness and durability. This paper deals with the ultra-precision polishing of aspheric molding dies for next-generation hard X-ray telescope mirrors, which require a super smooth surface with a roughness below 0.3 nm root-mean-square (rms). The material was machined using various methods, and a surface roughness of 0.23 nm rms was obtained on aspheric molding dies of 300 mm in diameter. A surface roughness of 0.16 nm rms was achieved on platinum/carbon multilayer mirrors, replicated from plano dies. |
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Keywords: | Optics Polishing Molding die |
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