Current Optics and Photonics

Optical Society of Korea (한국광학회)
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New Bending System Using a Segmented Vacuum Chuck for Stressed Mirror Polishing of Thin Mirrors

  • Kang, Pilseong (Advanced Instrumentation Institute, Korea Research Institute of Standards and Science) ;
  • Yang, Ho-Soon (Advanced Instrumentation Institute, Korea Research Institute of Standards and Science)
  • Received : 2017.08.28
  • Accepted : 2017.10.23
  • Published : 2017.12.25
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Abstract

In the present research, a new bending system using a segmented vacuum chuck for Stressed Mirror Polishing (SMP) is developed. SMP is a special fabrication method for thin aspheric mirrors, where simple flat or spherical fabrication is applied while a mirror blank is deflected. Since a mirror blank is usually glued to a bending fixture in the conventional SMP process, there are drawbacks such as long curing time, inconvenience of mirror replacement, risk of mirror breakage, and stress concentration near the glued area. To resolve the drawbacks, a new bending system is designed to effectively hold a mirror blank by vacuum. For the developed bending system, the optimal bending load to achieve the designated mirror deflection is found by finite element analysis and an optimization algorithm. With the measurement results of the deflected mirror surfaces with the optimal bending loads, the feasibility of the developed bending system is investigated. As a result, it is shown that the bending system is appropriate for the SMP process.

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References

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