Fast and furious focal-plane wavefront sensing at W.M. Keck Observatory

Steven P. Bos; Michael Bottom; Sam Ragland; Jacques-Robert Delorme; Sylvain Cetre; Laurent Pueyo

doi:10.1117/12.2596147

1 September 2021 Fast and furious focal-plane wavefront sensing at W.M. Keck Observatory

Steven P. Bos, Michael Bottom, Sam Ragland, Jacques-Robert Delorme, Sylvain Cetre, Laurent Pueyo

Proceedings Volume 11823, Techniques and Instrumentation for Detection of Exoplanets X; 118231E (2021) https://doi.org/10.1117/12.2596147
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

High quality, repeatable point-spread functions are important for science cases like direct exoplanet imaging, high-precision astrometry, and high-resolution spectroscopy of exoplanets. For such demanding applications, the initial on-sky point-spread function delivered by the adaptive optics system can require further optimization to correct unsensed static aberrations and calibration biases. We investigated using the Fast and Furious focal-plane wavefront sensing algorithm as a potential solution. This algorithm uses a simple model of the optical system and focal plane information to measure and correct the point-spread function phase, without using defocused images, meaning it can run concurrently with science. On-sky testing demonstrated significantly improved PSF quality in only a few iterations, with both narrow and broadband filters. These results suggest this algorithm is a useful path forward for creating and maintaining high-quality, repeatable on-sky adaptive optics point-spread functions.

Conference Presentation

Citation Download Citation

Steven P. Bos, Michael Bottom, Sam Ragland, Jacques-Robert Delorme, Sylvain Cetre, and Laurent Pueyo "Fast and furious focal-plane wavefront sensing at W.M. Keck Observatory", Proc. SPIE 11823, Techniques and Instrumentation for Detection of Exoplanets X, 118231E (1 September 2021); https://doi.org/10.1117/12.2596147

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