Design and manufacture of ULE glass chopping secondary mirrors

W. Scott Smith; Mary J. Edwards

doi:10.1117/12.319280

25 August 1998 Design and manufacture of ULE glass chopping secondary mirrors

W. Scott Smith, Mary J. Edwards

Proceedings Volume 3352, Advanced Technology Optical/IR Telescopes VI; (1998) https://doi.org/10.1117/12.319280
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

ULE^TM titania-silica binary glass is being used for the primary, secondary, and tertiary mirrors for the Subaru 8- meter Japanese National Large Telescope. The primary 8.3- meter mirror blank was made by Corning Incorporated in 1994, and is in the final stages of optical polishing at Contraves Brashear Systems. Corning has also manufactured two of three lightweight secondary mirror blanks to date, and has delivered two lightweight tertiary blanks. These lightweight mirrors were designed and analyzed by Mitsubishi Electric Corporation and Contraves Brashear Systems to meet performance requirements. This paper describes key design criteria for the chopping secondary mirrors, including finite element analysis results. The manufacturing process used by Corning is also described.

Citation Download Citation

W. Scott Smith and Mary J. Edwards "Design and manufacture of ULE glass chopping secondary mirrors", Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); https://doi.org/10.1117/12.319280

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