Wide-Field Correction In Reflective Schmidt Systems By A Nonrotationally Symmetric Element

Irving R. Abel; Marcus R. Hatch

doi:10.1117/12.935436

26 October 1983 Wide-Field Correction In Reflective Schmidt Systems By A Nonrotationally Symmetric Element

Irving R. Abel, Marcus R. Hatch

Proceedings Volume 0399, Optical System Design, Analysis, and Production; (1983) https://doi.org/10.1117/12.935436
Event: 1983 International Technical Conference/Europe, 1983, Geneva, Switzerland

Abstract

Wide-field correction is achieved in reflective versions of the Schmidt and Schmidt-Cassegrain systems by the use of a fold mirror serving also as a corrector. The deformation of the corrector surface is divided into two functions one-with and one with-out rotational symmetry. The bulk of the deformation is defined by the rotationally symmetric part while the residual, which is of a much smaller magnitude, is nonrotationally symmetric. This separation of corrective polynomials facilitates fabrication of the elements. The larger rotationally symmetric part can be diamond turned on a two-axis machine under numerical control, whereas the small residual deformation can be hand figured to an overall system null or to a computer-generated holographic reference in an inter-ferometer. Diffraction-limited performance in the infrared region is achievable to an extent determined by tilt angle of the fold mirror and the f-number.

Citation Download Citation

Irving R. Abel and Marcus R. Hatch "Wide-Field Correction In Reflective Schmidt Systems By A Nonrotationally Symmetric Element", Proc. SPIE 0399, Optical System Design, Analysis, and Production, (26 October 1983); https://doi.org/10.1117/12.935436

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