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Communication Dans Un Congrès Année : 2010

Shack-Hartmann tomographic wavefront reconstruction using LGS: analysis of spot elongation and fratricide effect

Résumé

Noise effects induced by elongation have to be considered globally in a multi-channel tomographic reconstruction analysis. Such an analysis allows a fine estimation of performance and to compare launching options. We developed a modal LGS tomographic code based on pseudo-analytical matrix formalism. This modal analysis is computing and memory intensive. Therefore we limit the simulation to downscaled cases with diameters ranging from D = 4 to 21 m. We also limit the number of turbulent layers to a few equivalent layers. Including spot elongation and Rayleigh fratricide effect, when considering a global tomographic reconstruction, edge launching gives lightly better performance and limits the risk of possible underestimation of fratricide scatter.

Dates et versions

hal-03249983 , version 1 (04-06-2021)

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Citer

Clelia Robert, Jean-Marc Conan, Damien Gratadour, Cyril Petit, Thierry Fusco. Shack-Hartmann tomographic wavefront reconstruction using LGS: analysis of spot elongation and fratricide effect. 1st AO4ELT conference - Adaptive Optics for Extremely Large Telescopes, Jun 2009, Paris, France. pp.05010, ⟨10.1051/ao4elt/201005010⟩. ⟨hal-03249983⟩
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