2021/07/15 by Steven P. Bos, Michael Bottom, Bos, Steven P. +9
Physics and Astronomy · Engineering · #Adaptive optics and wavefront sensing #Astronomy and Astrophysical Research #Optical Systems and Laser Technology
paper · pdf · doi:10.48550/arxiv.2107.07601
High quality, repeatable point-spread functions are important for science\ncases like direct exoplanet imaging, high-precision astrometry, and\nhigh-resolution spectroscopy of exoplanets. For such demanding applications,\nthe initial on-sky point-spread function delivered by the adaptive optics\nsystem can require further optimization to correct unsensed static aberrations\nand calibration biases. We investigated using the Fast and Furious focal-plane\nwavefront sensing algorithm as a potential solution. This algorithm uses a\nsimple model of the optical system and focal plane information to measure and\ncorrect the point-spread function phase, without using defocused images,\nmeaning it can run concurrently with science. On-sky testing demonstrated\nsignificantly improved PSF quality in only a few iterations, with both narrow\nand broadband filters. These results suggest this algorithm is a useful path\nforward for creating and maintaining high-quality, repeatable on-sky adaptive\noptics point-spread functions.\n