Plantet, Cedric (INAF - Osservatorio di Arcetri, 50125 Firenze, Italy), Wizinowich, Peter (W. M. Keck Observatory, 65-1120 Mamalahoa Hwy., Kamuela, HI 96743, USA), Fusco, Thierry (Onera, the French Aerospace Lab, 92322 Chatillon, France), Neichel, Benoit (Aix Marseille Universite, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 13388 Marseille, France), Ragland, Sam (W. M. Keck Observatory, 65-1120 Mamalahoa Hwy., Kamuela, HI 96743, USA), Femenia, Bruno (W. M. Keck Observatory, 65-1120 Mamalahoa Hwy., Kamuela, HI 96743, USA)
Wavefront sensing in the near infrared has become an attractive option with the advent of new low-noise infrared detectors, such as the SAPHIRA (Selex) APD array. The performance improvements obtained with the H2RG-based Keck I near-infrared tip-tilt sensor is motivating the implementation of a near-infrared low-order sensor for Keck II. The recently proposed focal plane sensor algorithm LIFT could fulfill this role. We show here an analysis of performance, demonstrating that LIFT would provide a significant gain (~ 1 magnitude) over the current tip/tilt sensor at low flux, as well as the first experimental validation of LIFT on Keck with a calibration source.
10.26698/AO4ELT5.0027- Proceeding PDF