Rayleigh scattering, Fratricide effect and spot elongation: first on-sky results with GeMS
Abstract
GeMS, the Gemini MCAO system, is undergoing commissioning. Using 5 laser guide stars and a central launch, GeMS is particularly sensitive to Rayleigh backscatter and the fratricide effect. Using data covering a 5 months period, we will present results on: - Sodium return vs. Rayleigh background photons - mitigations and possible strategies to fratricide - Spot elongation measured - Benefits of fratricide for Laser Launch Telescope centering, fast acquisition procedure, cloud detection - Beam Transfer Optic design
- Publication:
-
Second International Conference on Adaptive Optics for Extremely Large Telescopes. Online at <A href="http://ao4elt2.lesia.obspm.fr">http://ao4elt2.lesia.obspm.fr</A
- Pub Date:
- September 2011
- Bibcode:
- 2011aoel.confE..54N