2020/12/03 by Alexander Madurowicz, Madurowicz, Alexander, Bruce Macintosh +27
Physics and Astronomy · Engineering · #Adaptive optics and wavefront sensing #Optical Systems and Laser Technology #Infrared Target Detection Methodologies
paper · pdf · doi:10.48550/arxiv.2012.02321
During its move from the mountaintop of Cerro Pachon in Chile to the peak of\nMauna Kea in Hawaii, the Gemini Planet Imager will make a pit stop to receive\nvarious upgrades, including a pyramid wavefront sensor. As a highly non-linear\nsensor, a standard approach to linearize the response of the pyramid is induce\na rapid circular modulation of the beam around the pyramid tip, trading off\nsensitivity for robustness during high turbulence. Using high temporal\nresolution Fourier Optics based simulations, we investigate phase\nreconstruction approaches that attempt to optimize the performance of the\nsensor with a dynamically adjustable modulation parameter. We have studied the\nlinearity and gain stability of the sensor under different modulation and\nseeing conditions, and the ability of the sensor to correct non-common-path\nerrors. We will also show performance estimates which includes a comparative\nanalysis of the atmospheric columns above the two mountains, as well as the\nError Transfer Functions of the two systems.\n