The GPU-based High-order adaptive OpticS Testbench (GHOST) at the European Southern Observatory (ESO) is a new 2-stage extreme adaptive optics (XAO) testbench at ESO. The GHOST is designed to investigate and evaluate new control methods (machine learning, predictive control) for XAO which will be required for instruments such as the Planetary Camera and Spectrograph of ESOs Extremely Large Telescope. The first stage corrections are performed in simulation, with the residual wavefront error at each iteration saved. The residual wavefront errors from the first stage are then injected into the GHOST using a spatial light modulator. The second stage correction is made with a Boston Michromachines Corporation 492 actuator deformable mirror and a pyramid wavefront sensor. The flexibility of the bench also opens it up to other applications, one such application is investigating the flip-flop modulation method for the pyramid wavefront sensor.
@article{arxiv.2411.05408,
title = {The GPU-based High-order adaptive OpticS Testbench},
author = {Byron Engler and Markus Kasper and Serban Leveratto and Cedric Taissir Heritier and Paul Bristow and Christophe Verinaud and Miska Le Louarn and Jalo Nousiainen and Tapio Helin and Markus Bonse and Sascha Quanz and Adrian Glauser and Julien Bernard and Damien Gratadour and Richard Clare},
journal= {arXiv preprint arXiv:2411.05408},
year = {2024}
}