Share Email Print
cover

Proceedings Paper

The Polychromatic Laser Guide Star for tilt measurement: progress report of the demonstrator at Observatoire de Haute Provence
Author(s): Renaud Foy; Pierre Éric; Jérôme Eysseric; Françoise Foy; Thierry Fusco; Julien Girard; Auguste Le Van Suu; Sandrine Perruchot; Pierre Richaud; Yoann Richaud; Xavier Rondeau; Michel Tallon; Éric Thiébaut; Michel Boër
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

The Polychromatic Laser Guide Star aims at providing for the tilt measurement from a LGS without any natural guide star. Thus it allows adaptive optics to provide us with a full sky coverage. This is critical in particular to extend adaptive optics to the visible range, where isoplanatism is so small that the probability is negligible to find a natural star to measure the tilt. We report new results obtained within the framework of the Polychromatic LGS programme ELP-OA. Natural stars have been used to mimic the PLGS, in order to check the feasibility of using the difference in the tilt at two wavelengths to derive the tilt itself. We report results from the ATTILA experiment obtained at the 1.52 m telescope at Observatoire de Haute-Provence. Tilts derived from the differential tilts are compared with direct tilt measurements. The accuracy of the measurements is currently ≈ 1.5 Airy disk rms at 550 nm. These results prove the feasibility of the Polychromatic Laser Guide Star programme ELP-OA. New algorithms based on inverse problems under development within our programme would lead to smaller error bars by 1 magnitude, as soon as they will run fast enough. We describe the ELP-OA demonstrator which we are setting up at the same telescope, with a special emphasis on the optimization of the excitation process, which definitely has to rely on the two-photon excitation of sodium atoms in the mesosphere. We will describe the implementation at the telescope, including the projector device, the focal instrumentation and the NdYAG pumped dye lasers.

Paper Details

Date Published: 24 September 2007
PDF: 8 pages
Proc. SPIE 6691, Astronomical Adaptive Optics Systems and Applications III, 66910R (24 September 2007); doi: 10.1117/12.733997
Show Author Affiliations
Renaud Foy, Univ. de Lyon, Observatoire de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Observatoire de Haute-Provence, CNRS (France)
Pierre Éric, Observatoire de Haute-Provence, CNRS (France)
Jérôme Eysseric, Observatoire de Haute-Provence, CNRS (France)
Françoise Foy, Univ. de Lyon, Observatoire de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Thierry Fusco, ONERA (France)
Julien Girard, Univ. de Lyon, Observatoire de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Univ. Nacional Autónoma de México (Mexico)
Auguste Le Van Suu, Observatoire de Haute-Provence, CNRS (France)
Sandrine Perruchot, Observatoire de Haute-Provence, CNRS (France)
Pierre Richaud, Observatoire de Haute-Provence, CNRS (France)
Yoann Richaud, Observatoire de Haute-Provence, CNRS (France)
Xavier Rondeau, Univ. de Lyon, Observatoire de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Michel Tallon, Univ. de Lyon, Observatoire de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Éric Thiébaut, Univ. de Lyon, Observatoire de Lyon, CNRS, Ecole Normale Supérieure de Lyon (France)
Michel Boër, Observatoire de Haute-Provence, CNRS (France)


Published in SPIE Proceedings Vol. 6691:
Astronomical Adaptive Optics Systems and Applications III
Robert K. Tyson; Michael Lloyd-Hart, Editor(s)

© SPIE. Terms of Use
Back to Top