Non-axisymmetric aberration patterns from wide-field telescopes using spin-weighted Zernike Polynomials [IMA]

If the optical system of a telescope is perturbed from rotational symmetry, the Zernike wavefront aberration coefficients describing that system can be expressed as a function of position in the focal plane using spin-weighted Zernike polynomials. Methodologies are presented to derive these polynomials to arbitrary order. This methodology is applied to aberration patterns produced by a misaligned Ritchey Chretian telescope and to distortion patterns at the focal plane of the DESI optical corrector, where it is shown to provide a more efficient description of distortion than conventional expansions.

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S. Kent
Mon, 13 Nov 17

Comments: 19 pages, 5 figures