Non-iterative aberration retrieval based on the spot shape around focus

Smid, Pieter; See, Chung W.; Somekh, Michael G.; Wright, Amanda J.

Abstract

A non-iterative, robust, aberration retrieval method to determine primary aberrations by utilizing the intensity distribution at and around focus is presented. The primary Zernike aberrations (coma, spherical aberration and astigmatism) are retrieved by fitting a set of orthogonal circle functions within the central region of the intensity distribution recorded at 3 different axial planes, typically taken at best focus and either side of focus. Aberration indicators are derived from these fits for each primary aberration and it is shown that these indicators can be used for aberration retrieval. The selected indicators vary almost linearly with the magnitude of aberration up to 0.13λ rms, corresponding to a Strehl ratio of 0.44. In the presence of multiple primary aberrations, the method is found to be reliable for a total rms wavefront deviation below 0.10λ (Strehl ratio of 0.68). This approach is linear and non-iterative and will therefore be beneficial for applications where speed and limiting photon exposure is important such as wavefront correction in biomedical imaging.

• Journal Article Type: Article
• Acceptance Date: May 10, 2022
• Online Publication Date: May 26, 2022
• Publication Date: 2022-10
• Deposit Date: Apr 12, 2023
• Publicly Available Date: Apr 18, 2023
• Journal: Optics and Lasers in Engineering
• Print ISSN: 0143-8166
• Electronic ISSN: 1873-0302
• Publisher: Elsevier BV
• Peer Reviewed: Peer Reviewed
• Volume: 157
• Article Number: 107108
• DOI: https://doi.org/10.1016/j.optlaseng.2022.107108
• Keywords: Electrical and Electronic Engineering; Mechanical Engineering; Atomic and Molecular Physics, and Optics; Electronic, Optical and Magnetic Materials
• Public URL: https://nottingham-repository.worktribe.com/output/8226434
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0143816622001609?via%3Dihub
• Additional Information: This article is maintained by: Elsevier; Article Title: Non-iterative aberration retrieval based on the spot shape around focus; Journal Title: Optics and Lasers in Engineering; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.optlaseng.2022.107108; Content Type: article; Copyright: © 2022 The Authors. Published by Elsevier Ltd.