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1st AO4ELT conference - Adaptive Optics for Extremely Large Telescopes
We report the status of ELP-OA (Étoile Laser polychromatique pour l'Optique Adaptative), the full demonstrator which we are building at OHP 1.52m telescope. The goal is to open adaptive optics to the domain of visible wavelengths at large telescopes, which is almost not feasible today because of the tiny isoplanatic patch. ELP-OA relies on the 2-photon excitation of sodium in the mesosphere, through 589 and 569 nm transitions. We use 2 pulsed dye lasers (on loan from CEA) pumped with NdYAGs.doi:10.1051/ao4elt/201004002 fatcat:r4xnupczjfdd7ndazy6zuw32a4