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Algorithm design for image-based wavefront control without wavefront sensing

  • Active optics is an enabling technology for future large space telescopes. Image-based wavefront control uses an image-sharpness metric to evaluate the optical performance. A control algorithm iteratively adapts a corrective element to maximize this metric, without reconstructing the wavefront. We numerically study a sharpness metric in the space of Zernike modes, and reveal that for large aberrations the Zernike modes are not orthogonal with respect to this metric. The findings are experimentally verified by using a unimorph deformable mirror as corrective element. We discuss the implications for the correction process and the design of control algorithms.
Author:Orestis Kazasidis, Sven Verpoort, Ulrich Wittrock
Parent Title (English):SPIE Optical Instrument Science, Technology, and Applications, Proc. SPIE
Document Type:Conference Proceeding
Date of Publication (online):2018/10/08
Date of first Publication:2018/10/24
Publishing Institution:Fachhochschule Münster - University of Applied Sciences
Release Date:2018/10/24
Tag:active optics, adaptive optics, sharpness metrics, aberration compensation, algorithm design
First Page:1069502
Faculties:Physikingenieurwesen (PHY)
Publication list:Wittrock, Ulrich
Licence (German):License LogoZweitveroeffentlichung