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    Technology of iron polishing for astronomical mirror（project of National Natural Science Foundation of China)
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    Update time： 2009-09-01
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      It was  checked and accepted by specialist group on 30th，January，2008。

      two spherical mirrors with aperture 200mm were figured by ion beam with surface accuracy less than 10nm(rms)。

      two plane mirrors with aperture 100mm were figured by ion beam with surface accuracy less than 8nm(rms)。
    Nanjing Institute of Astronomical Optics & Technology ,National Astronomical Observatories ,CAS