Presentation + Paper
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
Author Affiliations +
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
© (2021) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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KEYWORDS
Point spread functions

Wavefront sensors

Adaptive optics

Telescopes

Deformable mirrors

Control systems

Keck Observatory

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