Open AccessEffects of defocus and other quadratic errors on OTF
Author(s) -
Kevin Liang,
Miguel A. Alonso
Publication year - 2017
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.42.005254
Subject(s) - optics , astigmatism , optical transfer function , quadratic equation , simple (philosophy) , spatial frequency , quadratic function , physics , function (biology) , point spread function , geometrical optics , mathematics , geometry , philosophy , epistemology , evolutionary biology , biology
Even for the simplest nontrivial aberration, defocus, and for a circular pupil, there is no theoretical closed-form expression for the optical transfer function (OTF). By using a simple approximation, we provide a simple yet accurate approximation for the OTF of a defocused system. We generalize this approach to generic quadratic aberrations, including astigmatism.