Laser guide star spot shrinkage for affordable wavefront sensors

Wilfried Jahn; Emmanuel Hugot; Thierry Fusco; Benoit Neichel; Marc Ferrari; Carlos Correia; Laurent Pueyo; Kjetil Dohlen; Sandrine Pascal; Pascal Vola; Jean-François Sauvage; Kacem El Hadi; Jean Luc Gach

doi:10.1117/12.2232367

27 July 2016 Laser guide star spot shrinkage for affordable wavefront sensors

Wilfried Jahn, Emmanuel Hugot, Thierry Fusco, Benoit Neichel, Marc Ferrari, Carlos Correia, Laurent Pueyo, Kjetil Dohlen, Sandrine Pascal, Pascal Vola, Jean-François Sauvage, Kacem El Hadi, Jean Luc Gach

Author Affiliations +

Proceedings Volume 9909, Adaptive Optics Systems V; 99096L (2016) https://doi.org/10.1117/12.2232367
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

Innovative optical designs allow tackling the spot elongation issues in Shack-Hartman based laser guide star wavefront sensors. We propose two solutions using either a combination of two arrays of freeform microlenses, or a combination of freeform optics, to perform a shrinkage of the laser spots as well as a magnification of the SH focal plane. These approaches will drastically reduce the number of needed pixels, thus making possible the use of existing detectors. We present the recent advances on this activity as well as the estimation of performance, linearity and sensitivity of the compressed system in presence of aberrations.

Citation Download Citation

Wilfried Jahn, Emmanuel Hugot, Thierry Fusco, Benoit Neichel, Marc Ferrari, Carlos Correia, Laurent Pueyo, Kjetil Dohlen, Sandrine Pascal, Pascal Vola, Jean-François Sauvage, Kacem El Hadi, and Jean Luc Gach "Laser guide star spot shrinkage for affordable wavefront sensors", Proc. SPIE 9909, Adaptive Optics Systems V, 99096L (27 July 2016); https://doi.org/10.1117/12.2232367

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