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    Fabrication technology of astronomical mirror with large aperture and high accuracy
    Update time: 2009-09-15
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    first class prize of science & technology progress award of Jiangsu province in 2004,second class prize of national science & technology progress award in 2005

     It is anational key project in the Ninth-Five Year plan period funded by NSFC。

     The project group firstly developed computer-controlled active polishing technogy and fabricated polishing machine applied this technogy in China and successfully fabricated diameter 450mm active polishing disc as well as diameter 910mm paraboidal mirror with F ratio 2 and with surface accuracy of 1/30 wavelength(RMS)。Difficult problem for high spacial frequence error of surface during mirror fabrication of large aperture and deep asphericity as well as difficult problem during fabrication of large aperture tilted-axis aspherical mirror were solved。

      The project group firstly developed fabrication technogy of very thiner mirror with flexible supporting and fabrication method of large aperture very thiner mirror with computer-controlled close-loop active optics technogy。Very thiner hexagonal plano mirror with 1100mm of diagonal,25mm in thickness (applied to LAMOST) was successfully fabricared。Adopting similar fabrication method as that of diameter 4-8 meter mirror,very thinner spherical mirror which is 1035mm in diameter and 26mm in thickness with surface accuracy of 1/27 wavelength(RMS) was successfully fabricared。That indicates that difficult problem of lower rigidity during fabrication of very thinner mirror is successfully solved。 


    Nanjing Institute of Astronomical Optics & Technology ,National Astronomical Observatories ,CAS