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Wavefront sensor (WFS) design typically focuses on reference sources at the two extremes of spatial coherence: –spatially coherent natural guide stars (NGS) and spatially incoherent laser guide stars (LGS). We propose a hybrid WFS architecture for sources that fall between those two extremes such as might be achieved with an uplink corrected LGS source. This architecture uses a lenslet array to segment the pupil plane, but the subaperture size is based on the coherence area of the reference source, and a separate WFS technique behind each lenslet is used to achieve the desired spatial sampling of the wavefront. The initial concept presented here is a hybrid Shack-Hartmann Pyramid WFS, though the concept can be applied to other WFS techniques.
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Jeff Richey, Michael Hart, "Hybrid wave front sensor for partially coherent beacons," Proc. SPIE 11448, Adaptive Optics Systems VII, 114485X (13 December 2020); https://doi.org/10.1117/12.2560079