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An afocal freeform telescope has been prototyped at MIT Lincoln Laboratory. The design leverages an upgraded version of the Laboratory’s FANO design code to produce designs in afocal-space rather than imaging-space. The FANO code is unique, as it optimizes the surfaces using a Non-Uniform Rational B-Spline (NURBS) description rather than a polynomial-based equation. This approach allows the mirrors to take the most optimal shape without the limit of number of polynomial terms often hard-coded into commercial design software. Design comparisons with polynomial-based approaches are discussed showing improved performance when designing with NURBS shapes. Test results from the 150-mm diameter, 6x afocal magnification, 4° field-of-view prototype unit operating in the near-infrared band are shown.
James B. Johnson,Christopher D. Roll,Amanda Fontaine,Todd G. Ulmer, andJeffrey M. Roth
"Wide field-of-view NURBS-based freeform afocal telescope", Proc. SPIE 12530, Advanced Optics for Imaging Applications: UV through LWIR VIII, 1253009 (14 June 2023); https://doi.org/10.1117/12.2663846
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James B. Johnson, Christopher D. Roll, Amanda Fontaine, Todd G. Ulmer, Jeffrey M. Roth, "Wide field-of-view NURBS-based freeform afocal telescope," Proc. SPIE 12530, Advanced Optics for Imaging Applications: UV through LWIR VIII, 1253009 (14 June 2023); https://doi.org/10.1117/12.2663846