Imaging Freeform Optical Systems Designed with NURBS Surfaces

The designs of two imaging freeform systems using NURBS optical surfaces are described. The first system, a 10 deg x 9 deg f/2 three-mirror anastigmat has four times higher spatial resolution over the image plane compared with the equivalent conventional rotational aspheric design, and 2.5 times hig...

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Bibliographic Details
Main Authors: Chrisp,Michael P, Echter,Michael A, Primeau,Brian C
Format: Report
Language:English
Subjects:
anastigmat
aspheric shapes
aspherics
CUBIC SPLINE TECHNIQUE
FANO(fast accurate NURBS optimization)
focal planes
geometrical design
mechanical structure
mirror shapes
mirrors
NURBS(non-uniform rational basis-spline)
optical design
optical surfaces
Optics
point clouds
reflective
spectrometers
SPLINES (GEOMETRY)
telescopes
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Summary:The designs of two imaging freeform systems using NURBS optical surfaces are described. The first system, a 10 deg x 9 deg f/2 three-mirror anastigmat has four times higher spatial resolution over the image plane compared with the equivalent conventional rotational aspheric design, and 2.5 times higher resolution compared with a tenth order XY polynomial freeform design. The mirrors for the NURBS freeform design have more than twice the asphericity than the conventional rotational and XY polynomial designs. In the second system, a Ritchey-Chretien telescope followed by a two-mirror NURBS freeform corrector is compared to a four mirror Korsch telescope, for imaging to a visible-infrared imaging spectrometer. The freeform corrector design had 70% smaller spot sizes over the field and eliminated the large tertiary required in Korsch type design. Both of these NURBS freeform designs are possible due to a custom optical design code for fast accurate NURBS optimization (FANO), which now has parallel raytracing for thousands of NURBS grid points. Optical Engineering, 55, 7, 01 Jan 0001, 01 Jan 0001,