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Proceedings Paper

Closed-loop control for laser beam shaping system before guide star projection
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Paper Abstract

The adaptive optics system performance depends on multiple factors, including the quality of the laser beam before being projected to the mesosphere. Cumbersome procedures are required in the laser system to optimize the laser beam in terms of amplitude and phase. However, aberrations of the laser beam are still detected during the operations. The performance of laser projection systems can be improved compensating the effects of aberrations in the laser source or misalignment in the transfer optics before the laser beam propagating through the aperture. Despite the algorithm previously reported predict effective amplitude and phase correction is strongly dependent of an accurate DM characterization and transfer optics alignments. The use of feedback makes the system response better in presence of modeling error and external disturbances. A 2-DM closed loop approach for amplitude and a phase correction is designed. Finally the results of simulations and comparisons are discussed.

Paper Details

Date Published: 27 July 2016
PDF: 7 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 99095M (27 July 2016); doi: 10.1117/12.2233008
Show Author Affiliations
Pedro Escárate, Univ. Técnica Federico Santa María (Chile)
Sebastián Zúñiga, Univ. Técnica Federico Santa María (Chile)
Mario Castro, Univ. Técnica Federico Santa María (Chile)
Javier Garcés, Univ. Técnica Federico Santa María (Chile)
Diego Zagals, Univ. Técnica Federico Santa María (Chile)
José Marchioni, Univ. Técnica Federico Santa María (Chile)
Mauricio Solar, Univ. Técnica Federico Santa María (Chile)

Published in SPIE Proceedings Vol. 9909:
Adaptive Optics Systems V
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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