28 July 2010 A focal plane sensor for low-order sensing on laser tomographic systems: LIFT
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Abstract
Laser Tomographic systems, such as ATLAS, will rely on natural guide stars (NGS) to sense low order perturbation. This low order perturbation contains low order turbulence and Telescope Windshake, which strength lead to NGS wave front sensor (WFS) frame rate of several hundred Hertz. Therefore, the ability of the NGS WFS to deliver precise low order measurements in low signal to noise conditions will drive the limit magnitude of the NGS, hence the sky coverage. We have investigated the use of a focal plane sensor for this purpose, and consider it as the most efficient sensor in this context. We propose LIFT (LInearized Focal-plane Technique), and compare it to classical sensors, such as Quad Cell WFS, Pyramid WFS and Shack-Hartmann WFS. We derive an analytic model of the noise propagation law, which we validate on End-to-End diffractive simulations, based on realistic phase screens.
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Serge Meimon, Serge Meimon, Thierry Fusco, Thierry Fusco, Frederic Cassaing, Frederic Cassaing, } "A focal plane sensor for low-order sensing on laser tomographic systems: LIFT", Proc. SPIE 7736, Adaptive Optics Systems II, 773611 (28 July 2010); doi: 10.1117/12.857291; https://doi.org/10.1117/12.857291
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