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12 July 2019 Image-based wavefront correction for space telescopes
Orestis Kazasidis, Sven Verpoort, Ulrich Wittrock
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Proceedings Volume 11180, International Conference on Space Optics — ICSO 2018; 111807Z (2019) https://doi.org/10.1117/12.2536206
Event: International Conference on Space Optics - ICSO 2018, 2018, Chania, Greece
Abstract
With a view to future large space telescopes, we investigate image-based wavefront correction with active optics. We use an image-sharpness metric as merit function to evaluate the image quality, and the Zernike modes as control variables. In severely aberrated systems, the Zernike modes are not orthogonal to each other with respect to this merit function. Using wavefront maps, the PSF, and the MTF, we discuss the physical causes for the non-orthogonality of the Zernike modes with respect to the merit function. We show that for combinations of Zernike modes with the same azimuthal order, a flatter wavefront in the central region of the aperture is more important than the RMS wavefront error across the full aperture for achieving a better merit function. The non-orthogonality of the Zernike modes with respect to the merit function should be taken into account when designing the algorithm for image-based wavefront correction, because it may slow down the process or lead to premature convergence.
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Orestis Kazasidis, Sven Verpoort, and Ulrich Wittrock "Image-based wavefront correction for space telescopes", Proc. SPIE 11180, International Conference on Space Optics — ICSO 2018, 111807Z (12 July 2019); https://doi.org/10.1117/12.2536206
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KEYWORDS
Wavefronts
Monochromatic aberrations
Point spread functions
Modulation transfer functions
Spatial frequencies
Diffraction
Wavefront sensors
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