For research and development of Silicon Carbide (SiC) mirrors, the Korea Astronomy and Space Science Institute (KASI) and National Optical Astronomy Observatory (NOAO) have agreed to cooperate and share on polishing and measuring facilities, experience and human resources for two years (2014-2015). The main goals of the SiC mirror polishing are to achieve optical surface figures of less than 20 nm rms and optical surface roughness of less than 2 nm rms. In addition, Green Optics Co., Ltd (GO) has been interested in the SiC polishing and joined the partnership with KASI. KASI will be involved in the development of the SiC polishing and the optical surface measurement using three dierent kinds of SiC materials and manufacturing processes (POCOTM, CoorsTekTM and SSGTM corporations) provided by NOAO. GO will polish the SiC substrate within requirements. Additionally, the requirements of the optical surface imperfections are given as: less than 40 um scratch and 500 um dig. In this paper, we introduce the international collaboration and interim results for SiC mirror polishing and development.

ABSTRACT
1. INTRODUCTION
2. PROGRAM OVERVIEW
3. TECHNICAL VIEWPOINT
    3.1. Optical Surface Requirements
    3.2. Polishing Equipment
    3.3. Interim Results
4. IMPLICATIONS AND FUTURE PLANS
REFERENCES

• Jeong-Yeol Han(Korea Astronomy and Space Science Institute)
• Myung Cho(National Optical Astronomy Observatory)
• Gary Poczulp(National Optical Astronomy Observatory)
• Jakyung Nah(Korea Astronomy and Space Science Institute)
• Hyun-Joo Seo(Korea Astronomy and Space Science Institute/Yonsei University)
• Kyung-Hwan Kim(Korea Astronomy and Space Science Institute)
• Kyung-Mo Tahk(Korea Astronomy and Space Science Institute)
• Dong-Kyun Kim(Green Optics)
• Jinho Kim(Green Optics)
• Minho Seo(Green Optics)
• Jonggun Lee(Green Optics)
• Sung-Yeop Han(Green Optics)