Design and optimization of the Spherical Primary Optical Telescope (SPOT) primary mirror segment

Jason G. Budinoff; Gregory J. Michels

doi:10.1117/12.626566

9 September 2005 Design and optimization of the Spherical Primary Optical Telescope (SPOT) primary mirror segment

Jason G. Budinoff, Gregory J. Michels

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.

Citation Download Citation

Jason G. Budinoff and 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); https://doi.org/10.1117/12.626566

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