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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/23372
Title: Laboratory prototype for the demonstration of sodium laser guide star wavefront sensing on the E-ELT
Authors: Patti, Mauro 
LOMBINI, MATTEO 
SCHREIBER, LAURA 
Bregoli, G.
ARCIDIACONO, CARMELO 
Cosentino, G.
DIOLAITI, EMILIANO 
FOPPIANI, ITALO 
Issue Date: 2015
Journal: MEMORIE DELLA SOCIETA ASTRONOMICA ITALIANA 
Number: 86
First Page: 441
Abstract: The new class of Extremely Large Telescopes (ELT) relies on Sodium Laser Guide Stars (LGS) to improve the Adaptive Optics performance in terms of correction quality and sky coverage. The time instability and the vertical extension of the atmospheric Sodium layer density have a potential significant impact on the wavefront sensing accuracy. We describe a laboratory prototype which has been developed with the goal to investigate specific algorithms for wavefront sensing with these artificial sources under different conditions of sodium layer density profile, parallactic effects due to laser launch geometry and atmospheric turbulence. The prototype can emulate realistic elongated spots on the focal plane of a Shack-Hartmann wavefront sensor (SHWFS), including their intensity variations due to the time variability of the Sodium density vertical profile. In addition, multiple LGSs can be simulated, one at a time, and a two-layer atmospheric turbulence model is available. Herein we report the verification of prototype performances, including optical performance, accuracy of emulated Sodium density profiles and atmospheric turbulence features. <P />
URI: http://hdl.handle.net/20.500.12386/23372
URL: http://sait.oat.ts.astro.it/MSAIt860315/index.html
ISSN: 0037-8720
Bibcode ADS: 2015MmSAI..86..441P
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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