TY  - CONF
A1  - Kazasidis, Orestis
A1  - Verpoort, Sven
A1  - Wittrock, Ulrich
T1  - Algorithm design for image-based wavefront control without wavefront sensing
T2  - SPIE Optical Instrument Science, Technology, and Applications, Proc. SPIE
N2  - 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.
KW  - active optics, adaptive optics, sharpness metrics, aberration compensation, algorithm design
Y1  - 2018
UR  - https://www.hb.fh-muenster.de/opus4/frontdoor/index/index/docId/1476
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:836-opus-14760
UR  - https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10695/1069502/Algorithm-design-for-image-based-wavefront-control-without-wavefront-sensing/10.1117/12.2312523.full
VL  - 10695
SP  - 1069502
ER  -