High resolution residual wavefront reconstruction for closed-loop adaptive optics systems

Zhilei Ren; Zhentao Zhang; Jin Liu; Yonghui Liang

doi:10.1117/12.2562196

13 December 2020 High resolution residual wavefront reconstruction for closed-loop adaptive optics systems

Zhilei Ren, Zhentao Zhang, Jin Liu, Yonghui Liang

Proceedings Volume 11448, Adaptive Optics Systems VII; 1144853 (2020) https://doi.org/10.1117/12.2562196
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

High-resolution imaging with large ground-based telescope is challenging due to atmospheric turbulence. Adaptive optics (AO) system can provide real-time compensation for the wavefront distortion in the pupil of the telescope. However, the observed images still suffer from a blurring caused by the residual wavefront. Numerical post-processing with a good approximation of the residual wavefront can help to effectively remove the blur. In this paper, a gradients measurement model for the Shack-Hartmann wavefront sensor (WFS) in a closed-loop AO system is built. The model is based on the frozen flow hypothesis with knowledge of the wind velocities of atmospheric turbulence layers. Then a high resolution residual wavefront reconstruction method using multiframe Shack-Hartmann WFS measurements and deformable mirror voltages is presented. Numerical results show that the method can effectively improve the spatial resolution and accuracy of the reconstructed residual wavefront.

Citation Download Citation

Zhilei Ren, Zhentao Zhang, Jin Liu, and Yonghui Liang "High resolution residual wavefront reconstruction for closed-loop adaptive optics systems", Proc. SPIE 11448, Adaptive Optics Systems VII, 1144853 (13 December 2020); https://doi.org/10.1117/12.2562196

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