The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 39 Issue 2
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- Pages.103-103
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- 2014
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- 1226-2692(pISSN)
Removal of mid-frequency error from the off-axis mirror
- Kim, Sanghyuk (School of Space Research, Kyung Hee University) ;
- Pak, Soojong (School of Space Research, Kyung Hee University) ;
- Jeong, Byeongjoon (School of Space Research, Kyung Hee University) ;
- Shin, Sangkyo (Yoonseul) ;
- Kim, Geon Hee (Korea Basic Science Institute) ;
- Lee, Gil Jae (Korea Basic Science Institute) ;
- Chang, Seunghyuk (Center for Integrated Smart Sensors, KAIST) ;
- Yoo, Song Min (College of Engineering, Kyung Hee University) ;
- Lee, Kwang Jo (Dept. of Applied Physics, Kyung Hee University) ;
- Lee, Hyuckee (Samsung Electronics)
- Published : 2014.10.13
Abstract
Manufacturing of lens and mirror using Diamond Turning Machine (DTM) offers distinct advantages including short fabrication time and low cost as compared to grinding or polishing process. However, the DTM process can leave mid-frequency error in the optical surface which generates an undesirable diffraction effect and stray light. The mid-frequency error is expected to be eliminated by mechanical polishing after the DTM process, but polishing of soft surface of ductile aluminum is extremely difficult because the polishing process inevitably degrades the surface form accuracy. In order to increase its surface hardness, we performed electroless nickel plating on the surface of diamond-turned aluminum (Al-6061T6) off-axis mirrors, which was followed by the 6-hour-long baking process at
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