9 September 2005 Design and optimization of the Spherical Primary Optical Telescope (SPOT) primary mirror segment
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Proceedings Volume 5877, Optomechanics 2005; 587711 (2005) https://doi.org/10.1117/12.626566
Event: Optics and Photonics 2005, 2005, San Diego, California, United States
Abstract
The 3m Spherical Primary Optical Telescope (SPOT) will utilize a single ring of 0.86 m point-to-point hexagonal mirror segments. The f2.85 spherical mirror blanks will be fabricated by the same replication process used for mass-produced commercial telescope mirrors. Diffraction-limited phasing will require segment-to-segment radius of curvature (ROC) variation of ~1 micron. Low-cost, replicated segment ROC variations could be almost 1 mm, necessitating a method for segment ROC adjustment & matching. A mechanical architecture has been designed that allows segment ROC to be adjusted up to 400 microns while introducing a minimum figure error, allowing segment-to-segment ROC matching. A key feature of the architecture is the unique back profile of the mirror segments. The back profile of the mirror was developed with shape optimization in MSC.Nastran™ using optical performance response equations written with SigFit. A candidate back profile was generated which minimized ROC-adjustment-induced surface error while meeting the constraints imposed by the fabrication method.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jason G. Budinoff, Jason G. Budinoff, Gregory J. Michels, Gregory J. Michels, } "Design and optimization of the Spherical Primary Optical Telescope (SPOT) primary mirror segment", Proc. SPIE 5877, Optomechanics 2005, 587711 (9 September 2005); doi: 10.1117/12.626566; https://doi.org/10.1117/12.626566
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